object-file-convert: convert commits that embed signed tags

object-file-convert: convert commits that embed signed tags

As mentioned in the hash function transition plan commit mergetag
lines need to be handled.  The commit mergetag lines embed an entire
tag object in a commit object.

Keep the implementation sane if not fast by unembedding the tag
object, converting the tag object, and embedding the new tag object,
in the new commit object.

In the long run I don't expect any other approach is maintainable, as
tag objects may be extended in ways that require additional
translation.

To keep the implementation of convert_commit_object maintainable I
have modified convert_commit_object to process the lines in any order,
and to fail on unknown lines.  We can't know ahead of time if a new
line might embed something that needs translation or not so it is
better to fail and require the code to be updated instead of silently
mistranslating objects.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>