ceph_argparse: increment matchcnt on kwargs

ceph_argparse: increment matchcnt on kwargs

Currently when you pass a param in on the ceph cli as a kwarg
(--<param_name>) the matchcnt isn't incremented in the validate method
which is used to choose the right command signature.

This means currently things fail like:

  ceph orchestrator rgw rm --realm_name=default --zone_name=default
  no valid command found; 1 closest matches:
  orchestrator rgw rm <realm_name> <zone_name>
  Error EINVAL: invalid command

The '--realm_name' and '--zone_name' isn't counted to the matchcnt, so
'orchestrator rgw rm' isn't picked as the valid command.

This patch simply corrects this by incrementing matchcnt on the kwarg
validate path before calling shortcircuiting the loop.

Fixes: https://tracker.ceph.com/issues/43803
Signed-off-by: Matthew Oliver <moliver@suse.com>