I have no clue how it worked previously in CI, but now
it's using default path to the inventory - which does
not exist.

In addition to that, type=int in cliff will default to
None, so the check had to be rewritten - because we
always did cert expiry check instead of generating them.

Change-Id: I84d71558c2666ba2cfa47054f782d25ff0c1f691
(cherry picked from commit cd8ecfc8)

Moving the CLI to python allows for easier
maintenance and larger feature-set.

This patch introduces a few breaking changes!
The changes stem the nature of the cliff package.
- the order of parameters must be
  kolla-ansible <action> <arguments>
- mariadb_backup and mariadb_recovery now are
  mariadb-backup and mariadb-recovery

Closes-bug: #1589020
Signed-off-by: Roman Krček <roman.krcek@tietoevry.com>
Change-Id: I9749b320d4f5eeec601a055b597dfa7d8fb97ce2