Barak Merimovich test_and_ci all time

b3d2940a073f98c7776e1d0a391749b44df04ace | Author: Jon Haddad <jon@jonhaddad.com>
 | 2017-12-27 18:46:49-08:00

    Added --all to ClearSnapshot command, so entering the
    command without a parameter will now throw an exception instead of
    deleting all the snapshots.
    
    Patch by Barak Merimovich, Review by Jon Haddad for CASSANDRA-13391.
    
    Closes #182.