qa/standalone/mon-stretch/mon-stretch-uneven-crush-weights.sh: init

qa/standalone/mon-stretch/mon-stretch-uneven-crush-weights.sh: init

Initialize standalone test for stretched clusters,
testing uneven weight warnings and != 2 buckets
warnings.

Added `wait_for_health_gone()` function in ceph-helpers.sh
this function allows us to wait for health condition to
disappear when doing standalone tests.

Signed-off-by: Kamoltat <ksirivad@redhat.com>
(cherry picked from commit 2c25b29347c840cef451135bdc220992a91f7e4b)
Signed-off-by: Kamoltat <ksirivad@redhat.com>
Conflicts:
	qa/standalone/mon-stretch/mon-stretch-fail-recovery.sh -> trivial fix