Merge branch 'jk/quarantine-received-objects'

In order for the receiving end of "git push" to inspect the
received history and decide to reject the push, the objects sent
from the sending end need to be made available to the hook and
the mechanism for the connectivity check, and this was done
traditionally by storing the objects in the receiving repository
and letting "git gc" to expire it.  Instead, store the newly
received objects in a temporary area, and make them available by
reusing the alternate object store mechanism to them only while we
decide if we accept the check, and once we decide, either migrate
them to the repository or purge them immediately.

* jk/quarantine-received-objects:
  tmp-objdir: do not migrate files starting with '.'
  tmp-objdir: put quarantine information in the environment
  receive-pack: quarantine objects until pre-receive accepts
  tmp-objdir: introduce API for temporary object directories
  check_connected: accept an env argument

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