This patch add a readiness probe to the kuryr controller when
the ports pool functionality is enabled. This ensures the
controller pod is not set to ready until all the precreated ports
have been loaded into their respective pools. This helps admins
to know when the kuryr-controller pod is prepared to start serving
requests.
Note the kuryr-controller will reply to request even if it is not
on ready status. However, that will lead to trigger port creation
for new pods as the already existing ports may not be on their
respective pools yet.
Change-Id: Id47d3e7450551c19cb19d9278e459bd32bf364cf
8b05365955