Move GCP proxy code to the old [] proxy's location

1. Moved code for the GCP proxy to where the [] proxy code used to live.
3. Corrected reference to the GCP proxy location.
4. Misc changes to make ErrorProne and various tools happy.

+diekmann to LGTM terraform whitelist change.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=213630560

java/google/registry/proxy/kubernetes/proxy-service-canary.yaml

@@ -0,0 +1,50 @@
+kind: Service
+apiVersion: v1
+metadata:
+  namespace: default
+  name: proxy-service-canary
+spec:
+  selector:
+    app: proxy-canary
+  ports:
+  - protocol: TCP
+    port: 30000
+    nodePort: 31000
+    targetPort: health-check
+    name: health-check
+  - protocol: TCP
+    port: 30001
+    nodePort: 31001
+    targetPort: whois
+    name: whois
+  - protocol: TCP
+    port: 30002
+    nodePort: 31002
+    targetPort: epp
+    name: epp
+  - protocol: TCP
+    port: 30010
+    nodePort: 31010
+    targetPort: http-whois
+    name: http-whois
+  - protocol: TCP
+    port: 30011
+    nodePort: 31011
+    targetPort: https-whois
+    name: https-whois
+  type: NodePort
+---
+apiVersion: autoscaling/v2beta1
+kind: HorizontalPodAutoscaler
+metadata:
+  namespace: default
+  name: proxy-autoscale-canary
+  labels:
+    app: proxy-canary
+spec:
+  scaleTargetRef:
+    apiVersion: extensions/v1beta1
+    kind: Deployment
+    name: proxy-deployment-canary
+  maxReplicas: 10
+  minReplicas: 1