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WIP: Support mounting /sysroot (and /boot) read-only
We want to support extending the read-only state to cover `/sysroot` and `/boot`, since conceptually all of the data there should only be written via libostree. This change needs to be opt-in though to avoid breaking anyone. Add a `sysroot/readonly` key to the repository config which instructs `ostree-remount.service` to ensure `/sysroot` is read-only. This requires a bit of a dance because `/sysroot` is actually the same filesystem as `/`, which we can't mount readonly as we want `/etc` to be writable (and `/var` if it's there too). So we actually make it into a bind mount. Also add an API to instruct the libostree shared library that the caller has created a new mount namespace. This way we can freely remount read-write. This approach extends upon in a much better way previous work we did to support remounting `/boot` read-write. Closes: #1265
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