[EJBCLIENT-358] Modify testsuite for better integration of Byteman tests.

[rachmatowicz]

This PR does the following:

• creates a separate package for byteman tests: org.jboss.ejb.client.test.byteman
• replaces the default surefire test execution with a set of surefire test executions:
  -- one to disable the default
  -- one to run the non-Byteman tests
  -- one to run the Byteman tests (which require special configuration of surefire)
• set up the Byteman surefire execution to handle the vagaries of loading a Byteman agent over different JDK versions
• some other small rearrangements

Issue: https://issues.jboss.org/browse/EJBCLIENT-358