t1301: use test_when_finished for cleanup

Refactor several test cases to use "test_when_finished" for cleanup.

1. For first of these, we used to clean-up outside the test, but instead
   let's use test_when_finished for that.

2. For the second, we used to leave "new" after we are done, but not use
   it at all later. Now we do clean up.

3. For the rest, these child.git test repositories used to follow
   "initialize what we are going to use to a known state before we use"
   pattern, which is not wrong per-se, but now we use "clean up the
   cruft we made after we are done" pattern, which may arguably be
   better simply because the test that makes cruft should know what
   cruft it created better than whatever comes later that may not know.

Helped-by: Junio C Hamano <[email protected]>
Signed-off-by: Jiang Xin <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: jiangxin

t/t1301-shared-repo.sh

@@ -25,6 +25,7 @@ test_expect_success 'shared = 0400 (faulty permission u-w)' '
 for u in 002 022
 do
 	test_expect_success POSIXPERM "shared=1 does not clear bits preset by umask $u" '
+		test_when_finished "rm -rf sub" &&
 		mkdir sub && (
 			cd sub &&
 			umask $u &&
@@ -42,7 +43,6 @@ do
 			;;
 		esac
 	'
-	rm -rf sub
 done
 
 test_expect_success 'shared=all' '
@@ -132,6 +132,7 @@ test_expect_success POSIXPERM 'git reflog expire honors core.sharedRepository' '
 '
 
 test_expect_success POSIXPERM 'forced modes' '
+	test_when_finished "rm -rf new" &&
 	mkdir -p templates/hooks &&
 	echo update-server-info >templates/hooks/post-update &&
 	chmod +x templates/hooks/post-update &&
@@ -174,6 +175,7 @@ test_expect_success POSIXPERM 'forced modes' '
 '
 
 test_expect_success POSIXPERM 'remote init does not use config from cwd' '
+	test_when_finished "rm -rf child.git" &&
 	git config core.sharedrepository 0666 &&
 	umask 0022 &&
 	git init --bare child.git &&
@@ -193,7 +195,7 @@ test_expect_success POSIXPERM 're-init respects core.sharedrepository (local)' '
 '
 
 test_expect_success POSIXPERM 're-init respects core.sharedrepository (remote)' '
-	rm -rf child.git &&
+	test_when_finished "rm -rf child.git" &&
 	umask 0022 &&
 	git init --bare --shared=0666 child.git &&
 	test_path_is_missing child.git/foo &&
@@ -204,7 +206,7 @@ test_expect_success POSIXPERM 're-init respects core.sharedrepository (remote)'
 '
 
 test_expect_success POSIXPERM 'template can set core.sharedrepository' '
-	rm -rf child.git &&
+	test_when_finished "rm -rf child.git" &&
 	umask 0022 &&
 	git config core.sharedrepository 0666 &&
 	cp .git/config templates/config &&