centos based images have wrong label info,
these changes fix own image's name and build-date.
Change-Id: I1d13f8f386c8db12b5fbe5f8ecbbf9e3fbb4ba1c
Closes-Bug: #1680341
Use LABEL instruction instead of MAINTAINER (deprecated) instruc-
tion as suggested by Docker's official dockerfile guide.
docs.docker.com/engine/reference/builder/#maintainer-deprecated
Closes-Bug: #1683652
Change-Id: Ie87a1ddf31aefcd0b623fd2837d78de420e76898
Debian support is not maintained in Kolla so it got a bit behind Ubuntu
one. This changeset enables Debian for all images. Jessie (even with
backports) may be too old for some images though.
Also unify distro check to ['debian', 'ubuntu'] to keep alphabetical order
like it is done for RPM distributions.
Partially-Implements: blueprint multiarch-and-arm64-containers
Change-Id: I056233fbfa277e0e2360c07c3f80d9558c554357