Add non-cherry-pickable changes related to state "rb----"
Ganeti versions 2.11 and 2.12 have both had patches related to strange Xen domU states which are still legitimate running states, but Ganeti did not recognize them as such. The previous two cherry-picked patches bring some of these changes, but the final patch needed (79cb7ece ) cannot be cherry-picked because of a conflict with the other two patches. The changes were made on different branches, and merged together at a later time. This patch manually adds the change, merging together the descriptions of why certain states are allowed, and putting all of this into the function docstring. Signed-off-by: Hrvoje Ribicic <email@example.com> Reviewed-by: Helga Velroyen <firstname.lastname@example.org>