Remove unused heat/common/policy.py

Remove heat/common/policy.py, since we don't currently implement
policy filtering, and when we do we should use the oslo policy.py

Change-Id: I0c1d26ceed958d270f59edd612911ce24f74c1ff
Signed-off-by: Steven Hardy <shardy@redhat.com>
update openstack common and include policy.py

Sync with latest oslo (now at bd5d9f0), and update config to
pull in policy.py

Change-Id: I3571477cbf7c538c9ddb6860f85265ed503d2049
Signed-off-by: Steven Hardy <shardy@redhat.com>
Add initial code to support policy.json implementation

We don't currently support a policy.json file like
other openstack services, so this code (mostly copied
from glance, then modified a bit) will allow us to
add policy-based authorization to out APIs fairly
easily

Change-Id: I5ad9f55b3d0979e2526953bdce8b8227852e4b72
Signed-off-by: Steven Hardy <shardy@redhat.com>