[JBIDE-13522] reports host not reachable, added new openshift-java-client

When checking the user credentials, different exceptions are thrown.
There's a general purpose exception when something goes wrong. So far
it reported invalid credentials whereas it should have reported that
it could not verify the credentials.
Furthermore the new openshift-java-client 2.0.3 was added sice it
now supports double quoted libra_server values in express.conf