Run ODL CSIT on Apex from Cperf container

Run ODL CSIT on Apex from Cperf container

This patch adds the ability to deploy a cperf container and execute ODL
csit against an OPNFV deployment with ODL. The cperf job to execute csit
requires an RC file, SSH key to access OPNFV nodes, and a yaml
descriptor file that contains per node information about each
control/compute node.

This patch also adds triggering the cperf CSIT job inside of the 3rd
party ODL netvirt verification suite. That job uses Apex snapshots to
bring up deployment (no undercloud).

Additionally this patch includes some changes to allow multi version
snapshots to work. Multiple snapshots are now being created for
different OpenStack branches along with noha or HA type topologies. This
patch includes the ability to detect the desired scenario as triggered
by ODL Netvirt gerrit. Now in ODL netvirt gerrit a user may provide:
"check-opnfv <OS version>-<noha|ha>" style syntax to initiate 3rd Party
OPNFV CI on a particular OS version/HA setup.

Change-Id: I51a27545c985ce74c1c72fe0933eb451939a8c05
Signed-off-by: Jamo Luhrsen <jluhrsen@redhat.com>
Signed-off-by: Tim Rozet <trozet@redhat.com>
Signed-off-by: Jamo Luhrsen <jluhrsen@redhat.com>