Only initialize remote artifact cache connections if needed

This fixes a regression from the canonical-pull-urls branch that was
just merged. The `OSTreeCache.__init__()` function was connecting to
the cache, which is bad because execution would randomly freeze for
several seconds when the connection was slow.

We now only initialize remote connections where needed; this was
already introduced in 5c2ef6d076921bc0121e61efaa7a719c34ea1912 but
had regressed. I renamed the keyword arg from `fetch_remote_refs`
to `use_remote_cache` because it needs to be set for any interaction
with the remote cache, doesn't matter if they are fetches or pushes.

The initialization stage is also moved later so that we print a message
telling the user what we are up to before trying the network access.

0 files changed, 0 insertions, 0 deletions