This changes the signature of rename_ref() in refs.[hc] to include a
logmessage for the reflogs.
Also, builtin-branch.c is modified to provide a proper logmessage + call
setup_ident() before any logmessages are written.
Signed-off-by: Lars Hjemli <hjemli@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>