HA unit tests fail when run with thread sanitizer

failing unit tests:

• HAServiceStateMachineTest.waitingSyncingReadyLoadBalancing on freebsd-64
• HAServiceStateMachineTest.waitingSyncingReadyLoadBalancing on ubuntu-64

Jenkins job:

• https://jenkins.isc.org/job/kea-dev/job/ut-thread/97/

also added dhcp-ddns.sigint_test which sporadically fails

Creating Kea configuration file: /home/razvan/isc/git/kea-work/src/bin/d2/tests/test_config.json.
Kea log will be stored in /home/razvan/isc/git/kea-work/src/bin/d2/tests/test.log.
Running command "/home/razvan/isc/git/kea-work/src/bin/d2/kea-dhcp-ddns -c /home/razvan/isc/git/kea-work/src/bin/d2/tests/test_config.json".
INFO/test_lib: wait_for_kea .
Server successfully configured.
Sending signal 2 to Kea process (pid=674100).
INFO/test_lib: wait_for_message DCTL_SHUTDOWN: .
INFO/test_lib: wait_for_server_down kea-dhcp-ddns: .cat: /home/razvan/isc/git/kea-work/test_config.kea-dhcp-ddns.pid: No such file or directory