thread sanitizer reporting unit test in lib process

https://jenkins.isc.org/job/kea-1.7/job/ut-thread/3/testReport/

DStubControllerTest.ioSignals

Error Message
d_controller_unittests.cc:307
      Expected: 3
To be equal to: signals.size()
      Which is: 0
Stacktrace
d_controller_unittests.cc:307
      Expected: 3
To be equal to: signals.size()
      Which is: 0

failing on freebsd 12 and ubuntu 19.10

IOSignalTest.mixedSignals

Error Message
io_service_signal_unittests.cc:126
Failed
Test Time: 1000 expired
Stacktrace
io_service_signal_unittests.cc:126
Failed
Test Time: 1000 expired

failing on freebsd 12

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