Add gb review manifests

This MR adds manifests for deploying genome browser feature brances to review app namespace. Required for: https://github.com/Ensembl/ensembl-dauphin-style-compiler/pull/106 (ENSWBSITES-2460)

genome-browser/base/secrets.yaml

@@ -3,8 +3,7 @@ kind: Secret
 metadata:
   name: genome-browser-server-secrets
 type: Opaque
-data:
-  # Base64 encoded values
+stringData:
   DEBUG: "True"
-  MEMCACHED: new-genome-browser-memcached-svc:11211
+  MEMCACHED: genome-browser-memcached-svc:11211
   MEMCACHED_PREFIX: gb
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