noop_agent: Add unit testing
noop_agent: Add unit testing

Increase unit testing coverage by adding some unit tests to
the noop implementation of the agent.

Signed-off-by: Sebastien Boeuf <90b401417360b1924ef3f520ddee932686110f85@intel.com>

wcwxyz/virtcontainers,containers/virtcontainers,wcwxyz/virtcontainers,containers/virtcontainers,wcwxyz/virtcontainers