[NCL-274] Added support to integration test in EAP 6 with community build

Updated integration-test/pom.xml to 2 profiles, one is called: *wildfly-820*, which will be activated by default.

> mvn clean install

will do integration tests on wildfly:8.2.0.Final as what it is now.

Another profile is called: *eap640*, which can be used to do integration tests on EAP 6.4.x, people needs to specify an existed EAP 6.4.x zip URL in this case: