more terse push output

more terse push output

This changes the output of send-pack to match the new,
more terse fetch output. It looks like this:

To git://host.tld/path/to/repo
 + f3325dc...3b91d1c hasforce -> mirror/hasforce (forced update)
   f3325dc..bb022dc  master -> mirror/master
 ! [rejected]        needsforce -> mirror/needsforce (non-fast forward)
 * [new branch]      newbranch -> mirror/newbranch
 * [new tag]         v1.0 -> v1.0

instead of:

updating 'refs/heads/mirror/hasforce' using 'refs/heads/hasforce'
  from f3325dca9c4a34d74012c0e159254f454930cec7
  to   3b91d1c310ca9d7b547b85466dd876e143498304
updating 'refs/heads/mirror/master' using 'refs/heads/master'
  from f3325dca9c4a34d74012c0e159254f454930cec7
  to   bb022dc363d5c2aa9aa3026beb9706d44fbe1328
error: remote 'refs/heads/mirror/needsforce' is not an ancestor of
 local  'refs/heads/needsforce'.
 Maybe you are not up-to-date and need to pull first?
updating 'refs/heads/mirror/newbranch' using 'refs/heads/newbranch'
  from 0000000000000000000000000000000000000000
  to   3b91d1c310ca9d7b547b85466dd876e143498304
updating 'refs/tags/v1.0'
  from 0000000000000000000000000000000000000000
  to   bb022dc363d5c2aa9aa3026beb9706d44fbe1328

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>