doc: Created installation doc for Yum priorities. Ceph-specific packages need it.

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

diff --git a/doc/install/yum-priorities.rst b/doc/install/yum-priorities.rst
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+===========================
+ Installing YUM Priorities
+===========================
+
+Ceph builds packages for Apache and FastCGI (for 100-continue support) and
+QEMU (for ``rbd`` support). You must set priorities in your ``.repo`` 
+files to ensure that ``yum`` installs the Ceph packages instead of the 
+standard packages. The ``priorities`` setting requires you to install  
+and enable ``yum-plugin-priorities``.
+
+#. Install ``yum-plugin-priorities``. ::
+
+       sudo yum install yum-plugin-priorities
+
+#. Ensure ``/etc/yum/pluginconf.d/priorities.conf`` exists. :: 
+
+#. Ensure ``priorities.conf`` enables the plugin. :: 
+
+       [main]
+       enabled = 1