Fix Docker Registry image version to 2.5.1

https://hub.docker.com/r/library/registry/tags/ `registry:2` is constantly being updated with new versions. This means there's a possibility that the image may be changed unintentionally. For example, when the Pod is rescheduled on nodes that does not already have the image, depending on the time of the pull, `registry:2` may result in different images. Fix this to the latest `registry:2.5.1` instead to avoid this problem.

Fix Docker Registry image version to 2.5.1
9c850044 · Ricky Pai · GitHub · 8b5264e0 · 9c850044
Commit 9c850044 authored Nov 09, 2016 by Ricky Pai Committed by GitHub Nov 09, 2016
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registry-rc.yaml cluster/addons/registry/registry-rc.yaml +1 -1

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--- a/cluster/addons/registry/registry-rc.yaml
+++ b/cluster/addons/registry/registry-rc.yaml
@@ -21,7 +21,7 @@ spec:
    spec:
      containers:
      - name: registry
-        image: registry:2
+        image: registry:2.5.1
        resources:
          # keep request = limit to keep this container in guaranteed class
          limits: