Updated openstack/openstack
Project: openstack/requirements  42272a521a11a7d4cc2dec8651613f9a635ef27a

Update netaddr to 0.7.12 version for IPv6

Netaddr below 0.7.12 can not check IPv6 subnets for overlapping
It causes neutron to fail.

Change-Id: I139f51d2ef49d27e6ae29fe551df31c981653e7c
Closes-Bug: 1364166