Start/restart poll job when created or updated

This currently contains the logic for restarting updated jobs,
but nothing exercises this logic. The logic for starting polling
for a newly created pipeline is implemented.

main.go

@@ -46,7 +46,7 @@ func main() {
 		return
 	}
 
-	_ = poll.StartPolling(configData.Config.PipelineConf, db)
+	pollChan := poll.StartPolling(configData.Config.PipelineConf, db)
 
 	mux := http.NewServeMux()
 
@@ -57,5 +57,6 @@ func main() {
 		configData.Config.PipelineConf,
 		db,
 		runnerManagerChans,
+		pollChan,
 	))
 }