[nova] Switch cell2 postgres to image with flock
[nova] Switch cell2 postgres to image with flock

The custom image with flock protection prohibits parallel started
postgresql to both use the datadir and thus cause inconsistencies.

This is also a database patch-version update, as the old 9.5.4 is not
available as custom image.

sapcc/helm-charts,sapcc/helm-charts,sapcc/helm-charts,sapcc/helm-charts