Skip XML Schema validation.

Otherwise we get XML schema validation errors like the following,
and these are from documents that are produced by Activiti designer.

org.activiti.engine.ActivitiException: cvc-datatype-valid.1.2.1: '/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob' is not a valid value for 'NCName'. | /tmp/hudson3033965548003086587test/workflows/src/main/resources/diagrams/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob.bpmn20.xml | line 3 | column 224
cvc-attribute.3: The value '/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob' of attribute 'id' on element 'process' is not valid with respect to its type, 'ID'. | /tmp/hudson3033965548003086587test/workflows/src/main/resources/diagrams/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob.bpmn20.xml | line 3 | column 224
cvc-datatype-valid.1.2.1: 'BPMNDiagram_/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob' is not a valid value for 'NCName'. | /tmp/hudson3033965548003086587test/workflows/src/main/resources/diagrams/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob.bpmn20.xml | line 13 | column 140
cvc-attribute.3: The value 'BPMNDiagram_/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob' of attribute 'id' on element 'bpmndi:BPMNDiagram' is not valid with respect to its type, 'ID'. | /tmp/hudson3033965548003086587test/workflows/src/main/resources/diagrams/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob.bpmn20.xml | line 13 | column 140
cvc-datatype-valid.1.2.1: '/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob' is not a valid value for 'QName'. | /tmp/hudson3033965548003086587test/workflows/src/main/resources/diagrams/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob.bpmn20.xml | line 14 | column 252
cvc-attribute.3: The value '/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob' of attribute 'bpmnElement' on element 'bpmndi:BPMNPlane' is not valid with respect to its type, 'QName'. | /tmp/hudson3033965548003086587test/workflows/src/main/resources/diagrams/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob.bpmn20.xml | line 14 | column 252
cvc-datatype-valid.1.2.1: 'BPMNPlane_/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob' is not a valid value for 'NCName'. | /tmp/hudson3033965548003086587test/workflows/src/main/resources/diagrams/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob.bpmn20.xml | line 14 | column 252
cvc-attribute.3: The value 'BPMNPlane_/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob' of attribute 'id' on element 'bpmndi:BPMNPlane' is not valid with respect to its type, 'ID'. | /tmp/hudson3033965548003086587test/workflows/src/main/resources/diagrams/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob.bpmn20.xml | line 14 | column 252

    at org.activiti.engine.impl.util.xml.Parse.throwActivitiExceptionForErrors(Parse.java:186)
    at org.activiti.engine.impl.bpmn.parser.BpmnParse.execute(BpmnParse.java:222)
    at org.activiti.engine.impl.bpmn.deployer.BpmnDeployer.deploy(BpmnDeployer.java:86)
    at org.activiti.engine.impl.persistence.deploy.DeploymentCache.deploy(DeploymentCache.java:38)
    at org.activiti.engine.impl.persistence.entity.DeploymentManager.insertDeployment(DeploymentManager.java:42)
    at org.activiti.engine.impl.cmd.DeployCmd.execute(DeployCmd.java:58)
    at org.activiti.engine.impl.cmd.DeployCmd.execute(DeployCmd.java:30)
    at org.activiti.engine.impl.interceptor.CommandExecutorImpl.execute(CommandExecutorImpl.java:24)
    at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:42)
    at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:33)
    at org.activiti.engine.impl.RepositoryServiceImpl.deploy(RepositoryServiceImpl.java:46)
    at org.activiti.engine.impl.repository.DeploymentBuilderImpl.deploy(DeploymentBuilderImpl.java:106)
    at com.cisco.step.jenkins.plugins.jenkow.JenkowBuilder.perform(JenkowBuilder.java:104)
    at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19)
    at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:703)
    at hudson.model.Build$RunnerImpl.build(Build.java:178)
    at hudson.model.Build$RunnerImpl.doRun(Build.java:139)
    at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:473)
    at hudson.model.Run.run(Run.java:1410)
    at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
    at hudson.model.ResourceController.execute(ResourceController.java:88)
    at hudson.model.Executor.run(Executor.java:238)

org.activiti.engine.ActivitiException: cvc-datatype-valid.1.2.1: '/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob' is not a valid value for 'NCName'. | /tmp/hudson3033965548003086587test/workflows/src/main/resources/diagrams/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob.bpmn20.xml | line 3 | column 224
cvc-attribute.3: The value '/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob' of attribute 'id' on element 'process' is not valid with respect to its type, 'ID'. | /tmp/hudson3033965548003086587test/workflows/src/main/resources/diagrams/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob.bpmn20.xml | line 3 | column 224
cvc-datatype-valid.1.2.1: 'BPMNDiagram_/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob' is not a valid value for 'NCName'. | /tmp/hudson3033965548003086587test/workflows/src/main/resources/diagrams/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob.bpmn20.xml | line 13 | column 140
cvc-attribute.3: The value 'BPMNDiagram_/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob' of attribute 'id' on element 'bpmndi:BPMNDiagram' is not valid with respect to its type, 'ID'. | /tmp/hudson3033965548003086587test/workflows/src/main/resources/diagrams/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob.bpmn20.xml | line 13 | column 140
cvc-datatype-valid.1.2.1: '/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob' is not a valid value for 'QName'. | /tmp/hudson3033965548003086587test/workflows/src/main/resources/diagrams/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob.bpmn20.xml | line 14 | column 252
cvc-attribute.3: The value '/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob' of attribute 'bpmnElement' on element 'bpmndi:BPMNPlane' is not valid with respect to its type, 'QName'. | /tmp/hudson3033965548003086587test/workflows/src/main/resources/diagrams/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob.bpmn20.xml | line 14 | column 252
cvc-datatype-valid.1.2.1: 'BPMNPlane_/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob' is not a valid value for 'NCName'. | /tmp/hudson3033965548003086587test/workflows/src/main/resources/diagrams/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob.bpmn20.xml | line 14 | column 252
cvc-attribute.3: The value 'BPMNPlane_/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob' of attribute 'id' on element 'bpmndi:BPMNPlane' is not valid with respect to its type, 'ID'. | /tmp/hudson3033965548003086587test/workflows/src/main/resources/diagrams/files/kohsuke/ws/jenkins/jenkow-plugin/jenkow-plugin/target/test-classes/diagrams/SimpleWfCallsJob.bpmn20.xml | line 14 | column 252

    at org.activiti.engine.impl.util.xml.Parse.throwActivitiExceptionForErrors(Parse.java:186)
    at org.activiti.engine.impl.bpmn.parser.BpmnParse.execute(BpmnParse.java:222)
    at org.activiti.engine.impl.bpmn.deployer.BpmnDeployer.deploy(BpmnDeployer.java:86)
    at org.activiti.engine.impl.persistence.deploy.DeploymentCache.deploy(DeploymentCache.java:38)
    at org.activiti.engine.impl.persistence.entity.DeploymentManager.insertDeployment(DeploymentManager.java:42)
    at org.activiti.engine.impl.cmd.DeployCmd.execute(DeployCmd.java:58)
    at org.activiti.engine.impl.cmd.DeployCmd.execute(DeployCmd.java:30)
    at org.activiti.engine.impl.interceptor.CommandExecutorImpl.execute(CommandExecutorImpl.java:24)
    at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:42)
    at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:33)
    at org.activiti.engine.impl.RepositoryServiceImpl.deploy(RepositoryServiceImpl.java:46)
    at org.activiti.engine.impl.repository.DeploymentBuilderImpl.deploy(DeploymentBuilderImpl.java:106)
    at com.cisco.step.jenkins.plugins.jenkow.JenkowBuilder.perform(JenkowBuilder.java:104)
    at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:19)
    at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:703)
    at hudson.model.Build$RunnerImpl.build(Build.java:178)
    at hudson.model.Build$RunnerImpl.doRun(Build.java:139)
    at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:473)
    at hudson.model.Run.run(Run.java:1410)
    at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)
    at hudson.model.ResourceController.execute(ResourceController.java:88)
    at hudson.model.Executor.run(Executor.java:238)
Listening for transport dt_socket at address: 8000
Bad habit to catch all exceptions and move on as if nothing happened.