Updated openstack/openstack
Project: openstack/nova  f11731a7681a71cb29d6d29ef89fb1a65b307cec
null
Refactor network_utils to new call_xenapi pattern

Move network_utils to the new call_xenapi style, and add some unit
tests, and to make the unit reasonable, start raising NovaException.

Change-Id: I991965ffd57bf4b309cac8c6e9d4ef94f8d430f2