send-pack: generate packfiles via the object database

When pushing, git-send-pack(1) spawns git-pack-objects(1) directly to
generate the packfile that gets sent to the remote. Same as with
git-upload-pack(1), which has been adapted in the preceding commit,
this hard-codes the assumption that objects can be packed via
git-pack-objects(1), which is specific to the "files" backend.

Convert git-send-pack(1) to use the pack generation interface of the
object database instead.

Note that this requires us to adapt t5516 because the parameters passed
to git-pack-objects(1) are changing:

  - The order of arguments changes.

  - We pass "--quiet" instead of "-q".

  - We don't pass "--all-progress-implied" anymore when not generating
    output.

All of these changes are benign though and should not result in a change
in behaviour.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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