Fix default pull not to do an unintended Octopus.

The refspecs specified in the .git/remotes/<remote> on the "Pull: "
lines are for fetching multiple heads in one go, but most of the time
making an Octopus out of them is not what is wanted.  Make git-fetch
leave the marker in .git/FETCH_HEAD file so that later stages can
tell which heads are for merging and which are not.

Tom Prince made me realize how stupid the original behaviour was.

Signed-off-by: Junio C Hamano <junkio@cox.net>

git-pull.sh

@@ -24,7 +24,9 @@ then
 		die "You need to first update your working tree."
 fi
 
-merge_head=$(sed -e 's/	.*//' "$GIT_DIR"/FETCH_HEAD | tr '\012' ' ')
+merge_head=$(sed -e '/	not-for-merge	/d' \
+	-e 's/	.*//' "$GIT_DIR"/FETCH_HEAD | \
+	tr '\012' ' ')
 
 case "$merge_head" in
 '')