sanlock: save client_id in token and report in status and use in -C
    
    When one process uses multiple registered connections there was no
    way to see the association between tokens/resources and client
    connections (client_id's) from the 'sanlock status -D' output.
    The ci (client_id) is now reported for resources in in status -D.
    A new option -C <client_id> is added for 'sanlock client release'
    (and others) to use in place of -p <pid>.  It was not possible
    to release specific resources from the command line with -p when
    a single process had multiple client connections.