kube play: sd-notify integration

Integrate sd-notify policies into `kube play`.  The policies can be
configured for all contianers via the `io.containers.sdnotify`
annotation or for indidivual containers via the
`io.containers.sdnotify/$name` annotation.

The `kube play` process will wait for all containers to be ready by
waiting for the individual `READY=1` messages which are received via
the `pkg/systemd/notifyproxy` proxy mechanism.

Also update the simple "container" sd-notify test as it did not fully
test the expected behavior which became obvious when adding the new
tests.

Signed-off-by: Valentin Rothberg <vrothberg@redhat.com>

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