Multiple ports are located in ports_re_added. Assume we have port_one
and port_two. It will loop through the ports. Port_one is iterated
first, events ['re_added'] is assigned port_one, events ['removed']
is assigned port_two. In the second loop, events ['re_added'] is set
to port_two instead of adding port_two to list. So after the loop,
only port_two is left in events ['re_added'].
Conflicts:
neutron/tests/unit/plugins/ml2/drivers/openvswitch/agent/test_ovs_neutron_agent.py
Change-Id: If8edd29dd741f1688ffcac341fd58173539ba000
Closes-Bug: #1864630
(cherry picked from commit 5600163e9b)
(cherry picked from commit 22df469504)
1b148c6839