UT fails in distcheck on centos 7
https://jenkins.aws.isc.org/view/Kea-manual/job/kea-manual/job/distcheck/11/execution/node/120/log/
16:13:21 [ RUN ] IOSignalTest.mixedSignals
16:13:21 ../../../../../src/lib/asiolink/tests/io_service_signal_unittests.cc:274: Failure
16:13:21 Expected equality of these values:
16:13:21 sigint_cnt
16:13:21 Which is: 21
16:13:21 (stop_at_count_/3)
16:13:21 Which is: 7
16:13:21 ../../../../../src/lib/asiolink/tests/io_service_signal_unittests.cc:275: Failure
16:13:21 Expected equality of these values:
16:13:21 sigusr1_cnt
16:13:21 Which is: 0
16:13:21 (stop_at_count_/3)
16:13:21 Which is: 7
16:13:21 ../../../../../src/lib/asiolink/tests/io_service_signal_unittests.cc:276: Failure
16:13:21 Expected equality of these values:
16:13:21 sigusr2_cnt
16:13:21 Which is: 0
16:13:21 (stop_at_count_/3)
16:13:21 Which is: 7
16:13:21 [ FAILED ] IOSignalTest.mixedSignals (21 ms)