Fix check_fixed_network_cidr for nova network

* Replace 'nova network-list' with 'nova net-list'
  in check_fixed_network_cidr function;
* Add network checks to Jenkins 'bvt_2' and 'smoke' tests
  ('TestHaVLAN' and 'deploy_simple_cinder')
* Fix default local patches to local repositories in settings.py

Change-Id: I859e308e3d1b4ff360b5e730275b21868e775d9f
Closes-Bug: #1381586