This patch adds resources, fixtures and base test_connectivity tests
for host with linuxbridge agent.
Model of host with linuxbridge agent is made in separate namespace
named "host-XXX". It has got connectivity with rabbit via ovs port.
Same port is used also to provide connectivity with different "hosts"
Co-Authored-By: Mathieu Rohon <mathieu.rohon@gmail.com>
Change-Id: I6230d8d09f77bd20674bf6c3be69fbc1627d66f8
Closes-bug: #1518675