cmake: suppress LeakSanitizer reports of known leaks

there are known leaks, which are tracked by qa/lsan.suppr, in Ceph.
so let's reuse it so we don't see them when running unit test with
ASan enabled.

see also https://clang.llvm.org/docs/AddressSanitizer.html#issue-suppression

Signed-off-by: Kefu Chai <[email protected]>

Author: tchaikov

cmake/modules/AddCephTest.cmake

@@ -32,7 +32,8 @@ function(add_ceph_test test_name test_path)
     set_property(TEST ${test_name}
       APPEND
       PROPERTY ENVIRONMENT
-      ASAN_OPTIONS=detect_odr_violation=0)
+      ASAN_OPTIONS=detect_odr_violation=0
+      LSAN_OPTIONS=suppressions=${CMAKE_SOURCE_DIR}/qa/lsan.supp)
   endif()
   set_property(TEST ${test_name}
     PROPERTY TIMEOUT ${CEPH_TEST_TIMEOUT})