Since nova network feature is deprecated long time ago and was used
when neutron service is not enabled then nova lists the network and
set the compute.fixed_network_name in tempest.conf.
Since now networking is taken care by neutron, so it is no longer
needed.
nova network related client code is also removed.
Change-Id: I47c791e9257e262f6ac17fffaa2b4af6273a168e
Signed-off-by: Chandan Kumar (raukadah) <chkumar@redhat.com>