Add config_setting to test whether asan/tsan/... is enabled.
Add config_setting to test whether asan/tsan/... is enabled.

duanguoxue/trunk,bazelment/trunk,mzhaom/trunk,mzhaom/trunk,bazelment/trunk,duanguoxue/trunk,bazelment/trunk,mzhaom/trunk,duanguoxue/trunk,bazelment/trunk