Hi, Everyone:
        When I am using TripleO to build an undercloud image, it will
install packages in /opt/stack/venvs/openstack. But SqlAlchemy version in
/opt/stack/venvs/openstack/lib is 0.7, but SqlAchemy in /user/lib/ is 0.8,
how can fix this? Why is Sqlalchemy version in venvs lower than /user/lib ?
How can control package version when building undercloud image?
        Thank you for any help in advance.
*Best Regards!*
*Chao Yan--------------**My twitter:Andy Yan @yanchao727
<https://twitter.com/yanchao727>*
*My Weibo:http://weibo.com/herewearenow
<http://weibo.com/herewearenow>--------------*
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