[terraform] upgrade staging tunnelbroker to 0.17-staging

Summary:
Upgrade staging tunnelbroker to 0.17-staging

Depends on D13455

Test Plan: deploy and confirm healthy tasks

Reviewers: varun, bartek

Reviewed By: varun

Subscribers: ashoat, tomek

Differential Revision: https://phab.comm.dev/D13472

services/terraform/remote/service_tunnelbroker.tf

@@ -1,7 +1,7 @@
 locals {
   tunnelbroker_config = {
     docker_image = "commapp/tunnelbroker"
-    docker_tag   = local.is_staging ? "0.16-staging" : "0.16"
+    docker_tag   = local.is_staging ? "0.17" : "0.16"
 
     grpc_port      = 50051
     websocket_port = 51001