WIP: core: Convert path to ostree convention when deleting

[jlebon]

E.g. we currently process all files under /var/lib/selinux/targeted as going into /usr/etc/selinux/targeted instead. But the rpmdb doesn't know that. So we need to do the translation even when deleting.

Another notable dir which falls in that bucket is /boot.

Fixes: #3421

[openshift-ci[bot]]

Skipping CI for Draft Pull Request. If you want CI signal for your change, please convert it to an actual PR. You can still manually trigger a test run with /test all

[jlebon]

Had whipped this up but then had to context switch. Just putting up what I have for now to get some early eyes on it and CI running. Will circle back later.

[cheese]

Any progress here?

[jlebon]

Not really, but thanks for pinging. Being able to override the selinux-policy is important. I'll look at this again in the following weeks.

[jlebon]

OK, I've revived this now and fixed the test!