Storage service helm chart integration + bugfixes (#315)

Add storage service and a persistent volume claim to helm charts. A few bugfixes for the api proxy.

fission-bundle/main.go

@@ -173,7 +173,7 @@ Options:
 		runMessageQueueMgr(routerUrl)
 	}
 
-	if arguments["--storageServicePort"] == true {
+	if arguments["--storageServicePort"] != nil {
 		port := getPort(arguments["--storageServicePort"])
 		filePath := arguments["--filePath"].(string)
 		runStorageSvc(port, filePath)