When a virtual device fails, its state goes to FAIL and then
DISCONNECTED. In DISCONNECTED we call schedule_activate_check() to
schedule an auto-activation if needed. We also schudule the deletion
of the link through delete_on_deactivate_check_and_schedule(). The
auto-activation attempt fails because the link deletion unmanages the
device; as a result, the device doesn't try to auto-activate again.

To fix this:

 - don't allow the device to auto-activate if the device deletion is
   pending;

 - check again if the device can be auto-activated after its deletion.

https://bugzilla.redhat.com/show_bug.cgi?id=1818697
!613
(cherry picked from commit e404585e)