Use ostree's BARE_USER_ONLY flag (#674)

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* Use ostree's BARE_USER_ONLY flag

Now that Ostree has a 'bare user only' mode for repositories, we should
use it.

This allows installing Flatpak run times inside different Docker layers.

Original patch by: Alexander Larsson <alexl@redhat.com>
Tested-by: Emmanuele Bassi <ebassi@gmail.com>

* Use the parent mode when creating a child repo

Instead of hard coding the repository mode, query the parent's mode.

* Gate bare-user-only repo creation behind an environment variable

We keep the default of bare-user repositories, but with an environment
variable we change new repositories to bare-user-only.

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