cli integration: fix wait race

The wait at the end of cli integration script could end up failing if
the process had already exited. This was making it look like the tests
have failed.

This change fixes the problem.

Docker-DCO-1.1-Signed-off-by: Cristian Staretu <cristian.staretu@gmail.com> (github: unclejack)

hack/make/test-integration-cli

@@ -31,5 +31,5 @@ bundle_test_integration_cli 2>&1 \
 
 DOCKERD_PID=$(cat $DEST/docker.pid)
 kill $DOCKERD_PID
-wait $DOCKERD_PID
+wait $DOCKERD_PID || true
 )