fixing compute_url_map, add cleanup script

Compute_url_map was broken by #509: It also merged in #393, which
has an erroneous understanding that compute_url_map always returns
a diff (integration tests show it does not).

Adding a cleanup script to help with environment hygiene.

Added cleanup to CI to help make tests less flakey.

scripts/cleanup-project.sh

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+# cleanup-project cleans up an ansible testing project
+#
+# WARNING: do not run tests against a project while
+# this is running, or else your tests will fail.
+#
+# dependencies:
+#  - google-cloud-sdk (gcloudgcloud )
+set -e
+PROJECT_ID="${1}"
+SERVICE_ACCOUNT_NAME="${2}"
+ZONE="us-central1-a"
+
+main() {
+    # note: the ordering here is deliberate, to start with
+    # leaf resources and work upwards to parent resources.
+    cleanup_resource "compute instances" "--zone=$ZONE"
+    cleanup_resource "compute target-http-proxies" "--global"
+    cleanup_resource "compute forwarding-rules" "--global"
+    cleanup_resource "compute url-maps" "--global"
+    cleanup_resource "compute backend-services" "--global"
+}
+
+cleanup_resource() {
+    resource_group="$1"
+    extra_delete_args="$2"
+
+    for resource in $(gcloud $resource_group list --project="${PROJECT_ID}" --format="csv[no-heading](name)"); do
+        gcloud $resource_group delete "${resource}" --project="${PROJECT_ID}" -q $extra_delete_args
+    done
+}
+
+main