t/t1NNN: allow local submodules

To prepare for the default value of `protocol.file.allow` to change to
"user", ensure tests that rely on local submodules can initialize them
over the file protocol.

Tests that only need to interact with submodules in a limited capacity
have individual Git commands annotated with the appropriate
configuration via `-c`. Tests that interact with submodules a handful of
times use `test_config_global` instead.

Signed-off-by: Taylor Blau <me@ttaylorr.com>

t/t1091-sparse-checkout-builtin.sh

@@ -449,7 +449,8 @@ test_expect_success 'interaction with submodules' '
 	(
 		cd super &&
 		mkdir modules &&
-		git submodule add ../repo modules/child &&
+		git -c protocol.file.allow=always \
+			submodule add ../repo modules/child &&
 		git add . &&
 		git commit -m "add submodule" &&
 		git sparse-checkout init --cone &&

t/t1500-rev-parse.sh

@@ -163,7 +163,8 @@ test_expect_success 'showing the superproject correctly' '
 	test_commit -C super test_commit &&
 	test_create_repo sub &&
 	test_commit -C sub test_commit &&
-	git -C super submodule add ../sub dir/sub &&
+	git -c protocol.file.allow=always \
+		-C super submodule add ../sub dir/sub &&
 	echo $(pwd)/super >expect  &&
 	git -C super/dir/sub rev-parse --show-superproject-working-tree >out &&
 	test_cmp expect out &&