ctdb: wrap reclock script

[phlogistonjohn]

Depends on: #124

Add a new ctdb-rados-mutex subcommand that is meant to serve as a direct wrapper around the ctdb_mutex_ceph_rados_helper command that "understands" some of the intended container workflow and argument style AND prevent issues in ctdb configuration where the cephx entity names are going to vary.

[dpulls[bot]]

:tada: All dependencies have been resolved !

[mergify[bot]]

This pull request now has conflicts with the target branch. Please resolve these conflicts and force push the updated branch.