We copied some codes/frameworks from Nova, but frogot to add
the original file informations, this tries to add them back.
Change-Id: I310d94fc334b6e72dc5eafa316f1b4842066ccbe
It is meaningless that we support config the cache backend manually which
only used in consoleauth.
Change-Id: I0fd5e47b92c2d62a052263e60c90c8caf56915f3
Closes-Bug: #1691408