[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:

> mvn -Peap640 -Deap6.zip.url=-Deap6.zip.url=http://download.devel.redhat.com/devel/candidates/JBEAP/JBEAP-6.4.0.DR12/jboss-eap-6.4.0.DR12.zip clean install
EAP 6.4 is based on 7.5.x tags.