leak tests: mark some update-index tests as passing with SANITIZE=leak

Mark some tests that match "*update-index*" 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>

t/t2101-update-index-reupdate.sh

@@ -6,6 +6,7 @@
 test_description='git update-index --again test.
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'update-index --add' '

t/t2102-update-index-symlinks.sh

@@ -8,6 +8,7 @@ test_description='git update-index on filesystem w/o symlinks test.
 This tests that git update-index keeps the symbolic link property
 even if a plain file is in the working tree if core.symlinks is false.'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success \

t/t2103-update-index-ignore-missing.sh

@@ -2,6 +2,7 @@
 
 test_description='update-index with options'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success basics '

t/t2104-update-index-skip-worktree.sh

@@ -5,6 +5,7 @@
 
 test_description='skip-worktree bit test'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 sane_unset GIT_TEST_SPLIT_INDEX

t/t2105-update-index-gitfile.sh

@@ -6,6 +6,7 @@
 test_description='git update-index for gitlink to .git file.
 '
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'submodule with absolute .git file' '