Agones: Use Helm agones.allocator.label (#215)

This removes the use of Kustomize patch to implement the appropriate
labels for ASM, and instead use the Helm configuration options that are
available in the latest versions of Agones.

Closes #173

infrastructure/files/agones/agones-install.yaml.tpl

@@ -19,23 +19,9 @@ helmCharts:
               portName: http-alloc
             grpc:
               enabled: false
+          labels:
+            istio.io/rev: asm-managed  #ASM managed dataplane channel
+            region: ${location}        #Region to identify the POD and send traffic
 
 resources:
   - agones-system.yaml
-
-patches:
-  - target:
-      kind: Deployment
-      name: agones-allocator
-    patch: |-
-      apiVersion: apps/v1
-      kind: Deployment
-      metadata:
-        name: agones-allocator
-        namespace: agones-system
-      spec:
-        template:
-          metadata:
-            labels:
-              istio.io/rev: asm-managed  #ASM managed dataplane channel
-              region: ${location}        #Region to identify the POD and send traffic