Updated openstack/openstack

Project: openstack/nova  ec8737a44842ee41fe9a4929d3e1996119fa15ee
null
Revert "Whitelist external netaddr requirement"

This reverts commit de59c55e77ead72df42c0445c09cf4d63131f6bd.

The netaddr developers have agreed to go back to uploading releases
to PyPI, so this workaround is no longer necessary. For details see
netaddr/netaddr#57 (comment) .

Change-Id: Ieeb3e8e549d9e4b53dba0165277fa2423d2eba01