cassandra unit tests ends with success even though they fail

some of the unit tests were reported as passed even though they fail due to broken cassandra environment

[ RUN      ] CqlLeaseMgrTest.maxDate4
/home/jenkins/workspace/kea-master-db-backends/src/share/database/scripts/cql/dhcpdb_drop.cql:19:OperationTimedOut: errors={'127.0.0.1': 'Client request timeout. See Session.execute[_async](timeout)'}, last_host=127.0.0.1
/home/jenkins/workspace/kea-master-db-backends/src/share/database/scripts/cql/dhcpdb_drop.cql:20:OperationTimedOut: errors={'127.0.0.1': 'Client request timeout. See Session.execute[_async](timeout)'}, last_host=127.0.0.1
runCqlSchema failed:cqlsh -u keatest -p keatest -k keatest -f/home/jenkins/workspace/kea-master-db-backends/src/share/database/scripts/cql/dhcpdb_drop.cql
[       OK ] CqlLeaseMgrTest.maxDate4 (56934 ms)

there are more of such tests here: https://jenkins.isc.org/job/kea-master-db-backends/29/consoleText just find runCqlSchema failed

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