Fix the wording about reporting differences when mgmt versions differ

The messages "reporting/not reporting differences in the model when mgmt
versions are different" were swapped. Fixed that.
[AS7-6551] Add version 2.0 of jboss-as-config schema.  Also update existing configuration based on 1.4 to use 2.0.
get rid of (now) useless dependency
enable UnusedImport check for checkstyle
Fix code to comply with more strict UnusedImport rules

* don't introduce compile import dependency in case javadoc is only user of imporated class
[AS7-6582] Clear reference to validator factory on undeploy.
AS7-6451 tests
AS7-6451 Config-property, marked with (config-property-ignored = true) annotation or descriptor isn't initialized after deployment
AS7-6565 single jdbc driver deployed inside ear takes name of ear
stabilize intermittent test failures
workaround issues when AS process became stale and FD kicks in only after 30 seconds
[AS7-6382] Manually iterate the addresses assigned to the interfaces for link local addresses.