doc: Added Auth Config Reference as standalone config reference.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>
doc: Added comment to enable message. Added link to Auth Config Reference.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>
doc: Removed auth entries from general. Part of an auth-specific section now.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>
doc: Added auth entry to index.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>
doc: fixed link and form edit.

Signed-off-by: John Wilkins <john.wilkins@inktank.com>
Merge git://github.com/ceph/ceph