Update git submodules
* Update kolla from branch 'master'
to b4d6ffaf5799c3c72a2ecfa3f08c6ae9ccf21df0
- Merge "CI: publish images on a weekly basis"
- CI: publish images on a weekly basis
To better utilise caches during the working week, we decided to publish
only weekly (as opposed to daily). This is due to DockerHub-imposed
limits.
If published images are broken, or need to be refreshed, then this patch
can be temporarily reverted.
Change-Id: I3916b703e40f0b80c47501ff7faa958b903be05c
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