Don't add Java EE common annotations jar to the endorsed path of testsuite

We had a hack in our testsuite pom to allow usage of @Resource(lookup=...) in testcases for Java 6. Now that we have mandated Java 7 for building AS, we no longer need it. The commit here removes that plugin configuration.

As for the reason why we had those plugin configurations for Java 6, the details are here http://www.jaitechwriteups.blogspot.in/2011/02/resource-and-new-lookup-attribute-how.html