MULE-7400: Deployment service is not locked when started

Conflicts:
	modules/launcher/src/main/java/org/mule/module/launcher/DeploymentDirectoryWatcher.java
	modules/launcher/src/test/java/org/mule/module/launcher/DeploymentServiceTestCase.java

Conflicts:
	modules/launcher/src/main/java/org/mule/module/launcher/MuleDeploymentService.java
	modules/launcher/src/test/java/org/mule/module/launcher/DeploymentServiceTestCase.java