The mechanism to generate a packfile corresponding to the result of
a fetch/push has been made pluggable through a set of object
database callback functions, removing hardcoded references to
'pack-objects' and enabling alternative ODBs to serve packfiles
themselves.
* ps/odb-pluggable-pack-generation:
bundle: generate packfiles via the object database
bundle: get (mostly) rid of `the_repository`
builtin/bundle: refactor option handling for progress meter
send-pack: generate packfiles via the object database
upload-pack: generate packfiles via the object database
odb: introduce interface to generate packfiles
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