fetch: Misc output cleanup

fetch: Misc output cleanup

In particular it removes duplicate information, uses short hashes (as
git-log and company) and uses .. for fast forwarding commits and ... for
not-fast-forwarding commits (shorter, easier to copy&paste). It also
reformat the output as:

1. the ones we store in our local ref (either branches or tags):

 1a) fast-forward

 * refs/heads/origin: fast forward to branch 'master' of ../git/
   old..new: 1ad7a06..bc1a580

 1b) same (only shown under -v)

 * refs/heads/next: same as branch 'origin/next' of ../git/
   commit: ce47b9f

 1c) non-fast-forward, forced

 * refs/heads/pu: forcing update to non-fast forward branch 'pu' of ../git/
   old...new: 7c733a8...5faa935

 1d) non-fast-forward, did not update because not forced

 * refs/heads/po: not updating to non-fast forward branch 'po' of ../git/
   old...new: 7c733a8...5faa935

 1e) creating a new local ref to store

 * refs/tags/v1.4.2-rc4: storing tag 'v1.4.2-rc4' of ../git/
   tag: 8c7a107
 * refs/heads/next: storing branch 'next' of ../git/
   commit: f8a20ae

2. the ones we do not store in our local ref (only shown under -v):

 * fetched branch 'master' of ../git
   commit: 695dffe
 * fetched tag 'v1.4.2-rc4' of ../git
   tag: 8c7a107

Signed-off-by: Santi B\e.A\eNijar <sbejar@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>