leak tests: mark various "generic" tests as passing with SANITIZE=leak

leak tests: mark various "generic" tests as passing with SANITIZE=leak

Mark various "generic" tests as passing when git is compiled with
SANITIZE=leak. These tests were subjectively picked from the lists of
passing tests since they're all small, and test some generic feature
such as wildmatch(), commonly used environment variables, ident
parsing etc.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>