Correct example salt config

The correct parameter is cloud not cloud_provider.

Correct example salt config
142018cf · Craig Jellick · 0662141f · 142018cf
Commit 142018cf authored Sep 24, 2015 by Craig Jellick
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@@ -82,7 +82,7 @@ An example file is presented below using the Vagrant based environment.
 [root@kubernetes-master] $ cat /etc/salt/minion.d/grains.conf
 grains:
  etcd_servers: $MASTER_IP
-  cloud_provider: vagrant
+  cloud: vagrant
  roles:
    - kubernetes-master
 ```