Remove netaddr useless requirement
Remove netaddr useless requirement

This patch cleans up the requirement list to remove netaddr module
that is not used anymore directly by cinder.

Change-Id: I0d0efbf26fb43e94f2ccc1a62edaba6f2b13f27e

Nexenta/cinder,openstack/cinder,NetApp/cinder,Nexenta/cinder,eharney/cinder,j-griffith/cinder,apporc/cinder,j-griffith/cinder,eharney/cinder,mahak/cinder,Hybrid-Cloud/cinder,Hybrid-Cloud/cinder,dims/cinder,ge0rgi/cinder,mahak/cinder,dims/cinder,cloudbase/cinder,phenoxim/cinder,bswartz/cinder,Datera/cinder,NetApp/cinder,openstack/cinder,phenoxim/cinder,cloudbase/cinder,Datera/cinder,apporc/cinder,bswartz/cinder