python: Remove init_lockspace() deprecated API
    
    write_lockspace() is used to replace init_lockspace() functionality
    as far back as in commit:
    
       commit 3e17957
       Author: Federico Simoncelli <fsimonce@redhat.com>
       Date:   Wed Apr 10 12:09:43 2013 -0400
    
           python: use the write commands in example.py
    
           The init_lockspace/resource commands have been obsoleted, the new ones
           are write_lockspace/resource.
    
    The old API was kept to support legacy python2-sanlock consuming code.
    Now that python2 is officialy retired this API can be removed.
    
    Signed-off-by: Amit Bawer <abawer@redhat.com>