fixes #2728 - POST /api/hostgroups does not accept ancestry
(cherry picked from commit 5f7b64bd2d70057b752c9a6e171e4d5a11a1348f)
fixes #2727 - fix oVirt test connection method definition
(cherry picked from commit 025ab6bcabeaec072381526c6b05ad1a2d974434)
fixes #2713 - do not update nics table on every host update as a workaround to bug #2489
(cherry picked from commit ecd9c9c66389eae0a159485b18afab61e6ee3d04)
fixes #2707 - host save fails for non-admin if host has a BMC interface
(cherry picked from commit 5a56d4d36f6bee4e75ca4a496512b406fb55ae1a)