Minor fixes on DeploymentSupervisor

- Avoid logging 'null' criteria
  - If the `deploymentProperties` doesn't have the container matching
criteria, then the `DefaultContainerMatcher` logs saying:
"No currently available containers match criteria 'null'"

- Add `POST_INITIALIZED_EVENT` StartMode for containers path cache
start()
We probably want to log that no containers were available even for the case where there is no criteria. So perhaps modify this (as well as the similar logging call you've modified below) so that the phrase "for criteria ..." is added only if there is criteria, but that a message for no containers will always be logged.