Add function for checking minions readiness for new commands

Function will check availability of target minions (optionally) and then
readiness of all minions.

Change-Id: I086dd979cbb32a4a796e85bfca6d668a2578c9df
Related-Prod: PROD-26381 (PROD:26381)
(cherry picked from commit a1edabaca734af23b6673ea59636f59f4be911b9)
1 file changed