Auditd tests hang on OSX

When running the following auditd test in a loop 1000's of times it occasionally
results in the test hanging - waiting to be terminated.

TEST_F(AuditTest, AuditStartedStopped)

{ stop_memcached_server(); ASSERT_TRUE(searchAuditLogForID(4096)); ASSERT_TRUE(searchAuditLogForID(4097)); }