Merge branch 'master' of github.com:openshift/training

uninstall.md

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+## Uninstallation
+
+During the beta period the preferred route of testing new beta code is to
+redeploy the host machines.  We understand that is not always an automated
+process so if you simply want to prepare a previously used host to test another
+beta release these are the steps that can be followed:
+
+~~~
+yum erase "*openshift*"
+
+# Erase all knowledge of the openshift units
+systemctl reset-failed
+systemctl daemon-reload
+
+# Remove data
+rm -rf /var/lib/openshift/
+rm /etc/sysconfig/*openshift*
+
+# Remove all docker processes and images.  This is not strictly required but
+# it's best to start from a clean slate.
+docker rm -f $(docker ps -a -q)
+docker rmi $(docker images -q)
+
+# Make sure you're running the latest RHEL 7.1 release
+yum update
+
+# This will clear the various virtual NICs
+reboot
+~~~