Add ability to switch database driver

Also added mysqlconnector packages into default installation.

blueprint enable-mysql-connector

Change-Id: Ib2cda7cb183dc8f0ff4759cc6e9ecab469fd121c
diff --git a/files/apts/neutron b/files/apts/neutron
index 92e0a06..d3a08c7 100644
--- a/files/apts/neutron
+++ b/files/apts/neutron
@@ -15,6 +15,7 @@
 python-eventlet
 python-sqlalchemy
 python-mysqldb
+python-mysql.connector
 python-pyudev
 python-qpid # dist:precise
 dnsmasq-base