leak tests: run various built-in tests in t00*.sh SANITIZE=leak

Mark various existing tests in t00*.sh that invoke git built-ins with
TEST_PASSES_SANITIZE_LEAK=true as passing when git is compiled with
SANITIZE=leak.

They'll now be listed as running under the
"GIT_TEST_PASSING_SANITIZE_LEAK=true" test mode (the "linux-leaks" CI
target).

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/t/t0001-init.sh b/t/t0001-init.sh
index df544bb..7603ad2 100755
--- a/t/t0001-init.sh
+++ b/t/t0001-init.sh
@@ -2,6 +2,7 @@
 
 test_description='git init'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 check_config () {