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Fix kubernetes charms not restarting services properly after host reboot on LXD

**What this PR does / why we need it**:

This fixes an issue when running the Kubernetes charms on LXD where the services don't restart properly after a reboot of the host machine.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: https://github.com/juju-solutions/bundle-canonical-kubernetes/issues/357

**Special notes for your reviewer**:

See https://github.com/juju-solutions/layer-cdk-service-kicker

**Release note**:

```release-note
Fix kubernetes charms not restarting services properly after host reboot on LXD
```