ensure at least one osd is up

ensure at least one osd is up

The existing task checks that the number of OSDs is equal to the number of up OSDs before continuing.

The problem is that if none of the OSDs have been discovered yet, the task will exit immediately and subsequent pool creation will fail (num_osds = 0, num_up_osds = 0).

This is related to Bugzilla 1578086.

In this change, we also check that at least one OSD is present. In our testing, this results in the task correctly waiting for all OSDs to come up before continuing.

Signed-off-by: David Waiting <david_waiting@comcast.com>
(cherry picked from commit 3930791cb7d2872e3388d33713171d7a0c1951e8)