doc: Added Key Management for ceph-deploy.

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

diff --git a/doc/rados/deployment/ceph-deploy-keys.rst b/doc/rados/deployment/ceph-deploy-keys.rst
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+=================
+ Keys Management
+=================
+
+
+Gather Keys
+===========
+
+Before you can provision a host to run OSDs or metadata servers, you must gather
+monitor keys and the OSD and MDS bootstrap keyrings. To gather keys, enter the
+following:: 
+
+       ceph-deploy gatherkeys {monitor-host}
+
+
+.. note:: To retreive the keys, you specify a host that has a
+   Ceph monitor. 
+
+
+Forget Keys
+===========
+
+When you are no longer using ``ceph-deploy`` (or if you are recreating a
+cluster),  you should delete the keys in the local directory of your admin host.
+To delete keys, enter the following:: 
+
+       ceph-deploy forgetkeys
+