(cherry picked from commit 423a475aff)
Local registry uses admin account password as authentication info.
And this password may be changed by openstack client at any time.
When sysinv tries to download images from local registry, it cannot
cache the auth info, otherwise it may lead to authentication failure
in keystone, and account be locked at the end.
Signed-off-by: Shuicheng Lin <firstname.lastname@example.org>