Replace "echo -n" with printf in shell scripts.

Not all echos know -n.  This was causing a test failure in
t5401-update-hooks.sh, but not t3800-mktag.sh for some reason.

Signed-off-by: Jason Riedy <ejr@cs.berkeley.edu>
Signed-off-by: Junio C Hamano <junkio@cox.net>

git-reset.sh

@@ -87,7 +87,7 @@ update_ref_status=$?
 case "$reset_type" in
 --hard )
 	test $update_ref_status = 0 && {
-		echo -n "HEAD is now at "
+		printf "HEAD is now at "
 		GIT_PAGER= git log --max-count=1 --pretty=oneline \
 			--abbrev-commit HEAD
 	}