upgrade: Add ability to specify registry credentials (bsc#1181095)

[tserong]

When using a local container registry with access credentials, these need to be specified in /srv/pillar/ceph/stack/global.yml so that the ceph container image can be pulled when adopting existing services. Here's an example of the format:

ses7_container_image: 192.168.121.1:5000/my/ceph/image
ses7_container_registry_auth:
  registry: 192.168.121.1:5000
  username: my_username_here
  password: my_very_secure_password_here

Fixes: https://bugzilla.suse.com/show_bug.cgi?id=1181095 Signed-off-by: Tim Serong tserong@suse.com

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Checklist:

• [ ] Added unittests and or functional tests
• [ ] Adapted documentation
• [ ] Referenced issues or internal bugtracker
• [ ] Ran integration tests successfully (trigger with "@susebot run teuthology" in a GitHub comment; see the wiki for more information)

[tserong]

should probably add this to the ses-doc, but otherwise lgtm!

Yep, I'll open a docs issue or PR once we cut the next DeepSea release