The original model used was to assert is_admin on the object context
which was actually used in only one place in ironic's code. Redudnantly
of course.
This is an excess call of is_admin on all API invocations, and is
simply not necessary as individual calls have API policy checking
and is_admin was only being consulted in the glance service utils...
However, the glance service utils also confirmed it should be able
to access glance if there was an auth_token present on the request
which should also always be the case. This was somewhat identified
as redundant/possible bug during the Wallaby cycle and appears to
be fine to remove
This does *not* remove the deprecated rule. At present, it appears
that rule may not be removed until after Xena.
Change-Id: I5a176f51db93d2a2238496f6955c1c7d9a79c548
f91915d4cd