doc: Added purge page to ceph-deploy.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>

diff --git a/doc/rados/deployment/ceph-deploy-purge.rst b/doc/rados/deployment/ceph-deploy-purge.rst
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+==============
+ Purge a Host
+==============
+
+When you remove Ceph daemons and uninstall Ceph, there may still be  extraneous
+data from the cluster on your server. The ``purge`` and  ``purgedata`` commands
+provide a convenient means of cleaning up a  host. 
+
+
+Purge Data
+==========
+
+To remove all data from ``/var/lib/ceph`` (but leave Ceph packages intact),
+execute the ``purgedata`` command.
+
+       ceph-deploy purgedata {hostname} [{hostname} ...]
+       
+
+Purge
+=====
+
+To remove all data from ``/var/lib/ceph`` and uninstall Ceph packages, execute
+the ``purge`` command.
+
+       ceph-deploy purge {hostname} [{hostname} ...]
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