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/deployment.yaml

@@ -54,7 +54,7 @@ spec:
         - secretRef:
             name: genome-browser-server-secrets
         command: ["/bin/sh","-c"]
-        args: [ 'echo "flush_all" | nc ${MEMCACHED/:/ }', 'echo "Memcached flushed at" `date`' ]
+        args: [ 'echo "${MEMCACHED/:/ }"']
       volumes:
         - name: genome-browser-server-data-vol
           nfs: