Add ability to configure websockets to the Undertow subsystem

Conflicts:
	undertow/src/main/java/org/wildfly/extension/undertow/ServletContainerAdd.java
	undertow/src/main/java/org/wildfly/extension/undertow/UndertowSubsystemParser_2_0.java
	undertow/src/main/java/org/wildfly/extension/undertow/deployment/UndertowDeploymentInfoService.java
	undertow/src/main/java/org/wildfly/extension/undertow/deployment/UndertowJSRWebSocketDeploymentProcessor.java
	undertow/src/main/resources/org/wildfly/extension/undertow/LocalDescriptions.properties
	undertow/src/main/resources/schema/wildfly-undertow_2_0.xsd
	undertow/src/main/resources/subsystem-templates/undertow.xml
	undertow/src/test/resources/org/wildfly/extension/undertow/undertow-2.0.xml
Undertow 1.1.0.CR5
Merge pull request #6826 from stuartwdouglas/undertow-websockets-8.x

Add ability to configure websockets to the Undertow subsystem