tests: use 'test_atexit' to stop httpd

Use 'test_atexit' to run cleanup commands to stop httpd at the end of
the test script or upon interrupt or failure, as it is shorter,
simpler, and more robust than registering such cleanup commands in the
trap on EXIT in the test scripts.

Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/lib-httpd.sh

@@ -14,7 +14,6 @@
 #
 #	test_expect_success ...
 #
-#	stop_httpd
 #	test_done
 #
 # Can be configured using the following variables.
@@ -176,7 +175,7 @@ prepare_httpd() {
 start_httpd() {
 	prepare_httpd >&3 2>&4
 
-	trap 'code=$?; stop_httpd; (exit $code); die' EXIT
+	test_atexit stop_httpd
 
 	"$LIB_HTTPD_PATH" -d "$HTTPD_ROOT_PATH" \
 		-f "$TEST_PATH/apache.conf" $HTTPD_PARA \
@@ -184,15 +183,12 @@ start_httpd() {
 		>&3 2>&4
 	if test $? -ne 0
 	then
-		trap 'die' EXIT
 		cat "$HTTPD_ROOT_PATH"/error.log >&4 2>/dev/null
 		test_skip_or_die $GIT_TEST_HTTPD "web server setup failed"
 	fi
 }
 
 stop_httpd() {
-	trap 'die' EXIT
-
 	"$LIB_HTTPD_PATH" -d "$HTTPD_ROOT_PATH" \
 		-f "$TEST_PATH/apache.conf" $HTTPD_PARA -k stop
 }