Add a test to exercise the 'merge.log' configuration option of 'git
fmt-merge-msg'. It controls the number of shortlog entries to display
in merge commit messages.
Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com>
Thanks-to: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>