Updated openstack/openstack
Project: openstack/horizon  470c9d76fc18620b4732cf5fbf3e57d4a8b154c9

Fixed row deletion for deleted stack

Now heat returns stack with "stack_status == 'DELETE_COMPLETE'"
for deleted stack. Added corresponding check to ajax handler.

HTTPNotFound is not used anymore and deprecated. Removed except
block for it.

Added raise to generic "except Exception" block to prevent
internal errors inside horizon.

Change-Id: Ia9cfd975790872918ba25c347319003ddc3468fa
Closes-Bug: #1367758