Merge pull request #6811 from gerrit-photon/master

Update photon image

library/photon

@@ -15,6 +15,6 @@ Tags: 1.0, 1.0-20191004
 GitFetch: refs/heads/1.0-20191004
 GitCommit: 0ab988e7b330b42f2746385bad0384c107c0f737
 
-Tags: 2.0, 2.0-20191004
-GitFetch: refs/heads/2.0-20191004
-GitCommit: da6cddceda2be282797e80bf5fd004a042508d2a
+Tags: 2.0, 2.0-20191018
+GitFetch: refs/heads/2.0-20191018
+GitCommit: 7934caed6be657dc648a0bed8724a15c2718ecc1