Merge branch 'master' into release-1.8

docs/admin/kubefed.md

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+---
+title: kubefed
+notitle: true
+---
 ## kubefed
 
 kubefed controls a Kubernetes Cluster Federation

docs/admin/kubefed_init.md

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+---
+title: kubefed init
+notitle: true
+---
 ## kubefed init
 
 Initialize a federation control plane

docs/admin/kubefed_join.md

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+---
+title: kubefed join
+notitle: true
+---
 ## kubefed join
 
 Join a cluster to a federation

docs/admin/kubefed_options.md

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+---
+title: kubefed options
+notitle: true
+---
 ## kubefed options
 
 Print the list of flags inherited by all commands

docs/admin/kubefed_unjoin.md

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+---
+title: kubefed unjoin
+notitle: true
+---
 ## kubefed unjoin
 
 Unjoin a cluster from a federation

docs/admin/kubefed_version.md

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+---
+title: kubefed version
+notitle: true
+---
 ## kubefed version
 
 Print the client and server version information