Add OpenStack verifications

Verify some operations from the OpenStack logs. One example from the "debugging port status update" documentation where the dhcp operations can be verified:

https://git.opendaylight.org/gerrit/#/c/70236/

If the DHCP provisioning does not succeed, e.g., if the dhcp agent is down, the port will not
transition to active. In order to determine if DHCP provisioning worked look for either of
the following two lines in the neutron logs:
``Provisioning for port <uuid of port> completed by entity DHCP.``

``Provisioning complete for port <uuid of port> triggered by entity DHCP.``