thread sanitizer reporting unit test in control agent
https://jenkins.isc.org/job/kea-1.7/job/ut-thread/3/testReport/
CtrlAgentControllerTest.sigintShutdown
Error Message
ca_controller_unittests.cc:255
Value of: elapsed_time.total_milliseconds() < 300
Actual: false
Expected: true
Stacktrace
ca_controller_unittests.cc:255
Value of: elapsed_time.total_milliseconds() < 300
Actual: false
Expected: true
failing on freebsd 12 and ubuntu 1910