AS: Added cleanup to ServerStateDetectors
AS: Commented part of the create server test due to the JBIDE-18737
Remove this line from pom.xml:
<tychoPluginProductParameter>org.eclipse.platform.ide</tychoPluginProductParameter>
Pass the parameter on the CLI or in Jenkins job to enable the tests to
be run on JBT and JBDS.
Reflecting changes made in RedDeer bug #861.
Removed necessity of settings.xml path parameter

Also EAP 6.3 requirement was added.
Few more minor fixes.