The current Promenade image is vulnerable to several CVEs:
CVE-2019-3462
CVE-2018-16865
CVE-2018-16864
Which Ubuntu 16.04/18.04 addresses.
This patchset makes the following changes:
1. Adds new distro specific dockerfiles for xenial/bionic.
2. Updates gates to be specific about the ubuntu image being
checked.
3. Updates .zuul.yaml checks/gates/post jobs for xenial/bionic.
4. Updates build-image.sh docker build for specific dockerfile
specified in config.sh (IMAGE_PROMENADE_DISTRO).
Change-Id: I89e5297a3baa8c2d2c142e5e29932476fc628398