Add java executable path to condor configuration

Add java executable path to condor configuration. Condor complains if it
can't find a java executable; CernVM doesn't add the path to the java
executable to $PATH.

Changes:
   * modified:   condor/manifests/client.pp
   * modified:   condor/templates/condor_config.local.csnode.erb
   * modified:   condor/templates/condor_config.local.node.erb