Microstack: personal-files interface - r/o $HOME/.kube

[jamespage]

For earlier context and discussion:

Request for human-review for auto-connect of interface 'personal-files' for microstack snap

Hmm actually after doing some testing it looks like the default AppArmor profile does allow a snap to stat a dot-file in $HOME - so it should be possible to test for the presence of ~/.kube and then prompt for this to be connected in that case. Thoughts?