Replaces network:* strings by constants
Replaces network:* strings by constants

This patch replaces all occurences of the strings
prefixed by network:* by their constant equivalent.

Closes-bug: #1270863
Change-Id: I149cc0ab7bde08ea83057e6c0697f668edbe29db

stackforge/networking-nec,stackforge/networking-nec,openstack/networking-nec,openstack/networking-nec