Comment 2 for bug 1735055

Starting from 4.1 we decided to read config changes from cassandra as opposed to polling api periodically. To do so we import from cfgm_common.vnc_object_db import VncObjectDBClient which
has a dependency on python-sqlalchemy.

For ubuntu,in analytics container, python-sqlalchemy was provided by python-contrail
In redhat there was no dependency on python-sqlalchemy by python-contrail.

root@a6s9(analytics):/# aptitude why python-sqlalchemy
i contrail-openstack-analytics Depends python-contrail (>= 4.1.0.0-55)
i A python-contrail Depends python-sqlalchemy
root@a6s9(analytics):/# lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.2 LTS
Release: 16.04
Codename: xenial