Add cleanup_snaphots parameter

We need to have an option to enable cleanup of outdated snaphots
in cassandra data dir as it's meaningless to keep them on db node as
we're storing backups in specific BACKUPDIR and copy backups on
remote backup server.

Change-Id: I24e83ce5f10751a3e54192d5aa0fd864628f6270
Related-PROD: PROD-27054
2 files changed