Add ability to switch database driver

Also added mysqlconnector packages into default installation.

blueprint enable-mysql-connector

Change-Id: Ib2cda7cb183dc8f0ff4759cc6e9ecab469fd121c
diff --git a/files/rpms/nova b/files/rpms/nova
index 6097991..ccee8a7 100644
--- a/files/rpms/nova
+++ b/files/rpms/nova
@@ -15,6 +15,7 @@
 libxml2-python
 numpy # needed by websockify for spice console
 m2crypto
+mysql-connector-python
 mysql-server # NOPRIME
 parted
 polkit