Fix order of synchronizing time when running ipa-client-install
    
    When running ipa-client-install, it asks for user name, synchronizes time, then asks for user password
    which the order could be confusing to some users. This changes ipa-client-install to synchronize time
    before prompting for user kerberos authentication.
    
    https://fedorahosted.org/freeipa/ticket/3957
    
    Reviewed-By: Petr Viktorin <pviktori@redhat.com>