Merge "Adding dependency documentation for MySQL."

doc/source/installation.rst

@@ -4,9 +4,30 @@ Installation
 
 At the command line::
 
-    $ pip install 
+    $ pip install oslo.db
 
 Or, if you have virtualenvwrapper installed::
 
-    $ mkvirtualenv 
-    $ pip install 
+    $ mkvirtualenv
+    $ pip install oslo.db
+
+You will also need to install at least one SQL backend::
+
+    $ pip install MySQL-python
+
+Or::
+
+    $ pip install pysqlite
+
+Using with MySQL
+----------------
+
+If using MySQL make sure to install the MySQL client development package for
+your distro. On Ubuntu this is done as follows::
+
+    $ sudo apt-get install libmysqlclient-dev
+    $ pip install MySQL-python
+
+The installation of MySQL-python will fail if libmysqlclient-dev is not
+installed first. Note that even in a virtual environment the MySQL package will
+be installed system wide.