JBoss - Update invoker servlets

* src/platform/jboss/deployers/ejbinvokerservlet.py
  src/platform/jboss/deployers/jmxinvokerservlet.py
  -- As stated in issue #21, we weren't prompting the user if they
  provided a war file, and instead bailing out.  We now prompt them
  to default to cmd.jsp before bailing out