wangxiyuan 2f803d3fa9 Remove DB downgrade
As downgrade are not supported after Kilo, we should remove them now.
Roll backs can be performed as mentioned in the below link:
http://docs.openstack.org/ops-guide/ops-upgrades.html#rolling-back-a-failed-upgrade

The DB downgrades were deprecated in Glance Mitaka release by commit
e3366afdfb227794fd46cfd8b2cf553a7ff1a709.

Change-Id: I937d15d93f16a3e44a50e6ff1a469098eab67c79
Implements: blueprint remove-db-downgrade
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Glance

Glance is a project that defines services for discovering, registering, retrieving and storing virtual machine images.

Use the following resources to learn more:

Description
OpenStack Image Management (Glance)
Readme 131 MiB
Languages
Python 99.9%