Remove netaddr useless requirement
Remove netaddr useless requirement

This patch cleans up the requirements.txt list to remove netaddr
module actually replaced by oslo_utils.

Change-Id: Ib454286350256b6141bc4a5c178b1ade73bd0223

NaohiroTamura/ironic,pshchelo/ironic,openstack/ironic,SauloAislan/ironic,openstack/ironic,pshchelo/ironic,SauloAislan/ironic,NaohiroTamura/ironic