smoke test: clean up backgrounded processes.
smoke test: clean up backgrounded processes.

GoogleChrome/lighthouse,tommycli/lighthouse,deepanjanroy/lighthouse,ev1stensberg/lighthouse,wardpeet/lighthouse,cedricbellet/lighthouse,GoogleChrome/lighthouse,arturmiz/lighthouse,umaar/lighthouse,tommycli/lighthouse,tommycli/lighthouse,arturmiz/lighthouse,cedricbellet/lighthouse,umaar/lighthouse,arturmiz/lighthouse,GoogleChrome/lighthouse,cedricbellet/lighthouse,tkadlec/lighthouse,mixed/lighthouse,GoogleChrome/lighthouse,wardpeet/lighthouse,tkadlec/lighthouse,tommycli/lighthouse,umaar/lighthouse,tkadlec/lighthouse,ev1stensberg/lighthouse,cedricbellet/lighthouse,wardpeet/lighthouse,deepanjanroy/lighthouse,cedricbellet/lighthouse,arturmiz/lighthouse,mixed/lighthouse,ev1stensberg/lighthouse,tommycli/lighthouse,wardpeet/lighthouse,mixed/lighthouse,GoogleChrome/lighthouse,deepanjanroy/lighthouse,deepanjanroy/lighthouse,umaar/lighthouse,deepanjanroy/lighthouse,arturmiz/lighthouse,ev1stensberg/lighthouse,tkadlec/lighthouse,wardpeet/lighthouse,mixed/lighthouse