Do kinit in client before connecting to backend
    
    The client installer was failing because a backend connection could be
    created before a kinit was done.
    
    Allow multiple simultaneous connections. This could fail with an NSS
    shutdown error when the second connection was created (objects still
    in use). If all connections currently use the same database then there
    is no need to initialize, let it be skipped.
    
    Add additional logging to client installer.
    
    https://fedorahosted.org/freeipa/ticket/2478