Remove a stale comment about SQLALCHEMY_DATABASE_DRIVER

SQLALCHEMY_DATABASE_DRIVER is no longer used
after If6d8d08e5b7b7c48ca012677b536d71058def6fd .

Also, remove mysql connector packages from the install list.

Closes-Bug: #1523377
Related-Bug: #1493304
Change-Id: I5ecbc3b0bac989faa5c46d3c2866558a505414d8
diff --git a/files/debs/keystone b/files/debs/keystone
index 0795167..370e4aa 100644
--- a/files/debs/keystone
+++ b/files/debs/keystone
@@ -1,6 +1,5 @@
 libkrb5-dev
 libldap2-dev
 libsasl2-dev
-python-mysql.connector
 python-mysqldb
 sqlite3
diff --git a/files/debs/neutron b/files/debs/neutron
index 85145d3..e53cc68 100644
--- a/files/debs/neutron
+++ b/files/debs/neutron
@@ -8,7 +8,6 @@
 libmysqlclient-dev
 mysql-server #NOPRIME
 postgresql-server-dev-all
-python-mysql.connector
 python-mysqldb
 rabbitmq-server # NOPRIME
 radvd # NOPRIME
diff --git a/files/debs/nova b/files/debs/nova
index fe57fc4..58dad41 100644
--- a/files/debs/nova
+++ b/files/debs/nova
@@ -15,7 +15,6 @@
 mysql-server # NOPRIME
 parted
 pm-utils
-python-mysql.connector
 python-mysqldb
 qemu # dist:wheezy,jessie NOPRIME
 qemu-kvm # NOPRIME
diff --git a/files/rpms/neutron b/files/rpms/neutron
index 9683475..2e49a0c 100644
--- a/files/rpms/neutron
+++ b/files/rpms/neutron
@@ -4,7 +4,6 @@
 ebtables
 iptables
 iputils
-mysql-connector-python
 mysql-devel
 MySQL-python
 mysql-server # NOPRIME
diff --git a/files/rpms/nova b/files/rpms/nova
index 00e7596..4db9a06 100644
--- a/files/rpms/nova
+++ b/files/rpms/nova
@@ -15,7 +15,6 @@
 libvirt-python # NOPRIME
 libxml2-python
 m2crypto
-mysql-connector-python
 mysql-devel
 MySQL-python
 mysql-server # NOPRIME
diff --git a/stackrc b/stackrc
index 5dd109c..0c311ad 100644
--- a/stackrc
+++ b/stackrc
@@ -72,18 +72,6 @@
     ENABLED_SERVICES+=,rabbit,tempest,mysql,dstat
 fi
 
-# SQLAlchemy supports multiple database drivers for each database server
-# type. For example, deployer may use MySQLdb, MySQLConnector, or oursql
-# to access MySQL database.
-#
-# When defined, the variable controls which database driver is used to
-# connect to database server. Otherwise using default driver defined for
-# each database type.
-#
-# You can find the list of currently supported drivers for each database
-# type at: http://docs.sqlalchemy.org/en/rel_0_9/core/engines.html
-# SQLALCHEMY_DATABASE_DRIVER="mysqldb"
-
 # Global toggle for enabling services under mod_wsgi. If this is set to
 # ``True`` all services that use HTTPD + mod_wsgi as the preferred method of
 # deployment, will be deployed under Apache. If this is set to ``False`` all