Automatic merge from submit-queue (batch tested with PRs 49326, 49394, 49346, 49379, 49399)
more robust stat handling from ceph df output in the kubernetes-master charm create-rbd-pv action
**What this PR does / why we need it**: more robust stat handling from ceph df output in the kubernetes-master charm create-rbd-pv action
**Release note**:
```release-note
more robust stat handling from ceph df output in the kubernetes-master charm create-rbd-pv action
```
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