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)
Upstream-commit: 22152ccc47e641050da85b80cebf2912b42fd122
Component: engine

components/engine/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
 )