Emit an error if the user is trying to deploy a WAR via the invoker servlet in jboss 5.x

* src/platform/jboss/deployers/ejbinvokerservlet.py
  src/platform/jboss/deployers/jmxinvokerservlet.py
  -- It's possible that no fingerprints are valid for deploying; dont crash
  if we dont find any
  -- Added a check to ensure we're deploying a JSP payload when the JBoss
  fingerprint is version 5.x.  Only JSP's can be deployed, as we're invoking
  the DFS deployer.