downgraded jboss-as to 7.2.0.Final

jboss-as-arquillian-container-managed
jboss-as-naming
jboss-as-server

used by droolsjbpm projects are not present in Nexus with version 7.4.0.Final.
It only exist 7.2.0.Final version.

Our droolsjbpm/jbpm on master is failing because of unsatisfied dependencies.