5824a0e ipa-client-install: Verify RPC connection with a ping

Authored and Committed by pviktori 10 years ago
    ipa-client-install: Verify RPC connection with a ping
    
    With old servers, it is possible that xmlclient.connect() succeeds
    but commands fail with a Kerberos error.
    
    Verify that commands succeed by sending a ping after connecting.
    
    Follow-up to: https://fedorahosted.org/freeipa/ticket/3931