Merge PR #27012 into master

Merge PR #27012 into master

* refs/pull/27012/head:
	common/options: allow (but to not prefer or require) secure mode
	common/options: make clients prefer to connect to mons via secure mode
	common/options: allow connections to mons in secure mode
	common/options: prefer secure mode between monitors
	auth/AuthRegistry: remove experimental flag for 'secure' mode

Reviewed-by: Neha Ojha <nojha@redhat.com>
Reviewed-by: Greg Farnum <gfarnum@redhat.com>