Updated openstack/openstack
Project: openstack/nova  49206454609e9acc5a2a8aab0c2f8775c7a8b3b6

Error code for creating secgroup default rule

Trying to create secgroup group default rules
that already exists gives HttpBadRequest error,
but it should raise HttpConflict.

So updated the code to HttpConflict error.
Closes-Bug: #1374320

Change-Id: I93c6eb7fb96e7109404206367ed81495a4724296