Add integration scenario test for Neutron LBaaS

- added new scenario test that checks work of Neutron LBaaS resource:
test creates stack with two servers and LB resource, checks connection,
adds one more member to LP and finally checks load balancing.

Co-Authored-by: Sergey Kraynev <skraynev@mirantis.com>

Change-Id: I5d05909d437a2ba7b047ae758f3b5d8669fc8b1b
4 files changed
tree: 4c9dfce5d9cbf3cecd66b5c16a98b8775b21ce94
  1. common/
  2. functional/
  3. scenario/