git-svn: be verbose by default on fetch/commit, add -q/--quiet option

git-svn: be verbose by default on fetch/commit, add -q/--quiet option

Slower connections can make git-svn look as if it's doing
nothing for a long time; leaving the user wondering if we're
actually doing anything.  Now we print some file progress just
to assure the user that something is going on while they're
waiting.

Added the -q/--quiet option to users to revert to the old method
if they preferred it.

Signed-off-by: Eric Wong <normalperson@yhbt.net>
Signed-off-by: Junio C Hamano <junkio@cox.net>