request-pull: pick up tag message as before

The previous two steps were meant to stop updating the explicit
refname the user gave to the command to a different ref that points
at it.  Most notably, we no longer substitute a branch name the user
used with a name of the tag that points at the commit at the tip of
the branch (it still can be done with "local-branch:remote-tag").

However, they also lost the code that included the message in a
tag when the user _did_ ask the tag to be pulled.  Resurrect it.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-request-pull.sh

@@ -132,6 +132,14 @@ for you to fetch changes up to %H:
 
 ----------------------------------------------------------------' $headrev &&
 
+if test $(git cat-file -t "$head") = tag
+then
+	git cat-file tag "$head" |
+	sed -n -e '1,/^$/d' -e '/^-----BEGIN PGP /q' -e p
+	echo
+	echo "----------------------------------------------------------------"
+fi &&
+
 if test -n "$branch_name"
 then
 	echo "(from the branch description for $branch_name local branch)"