investigate result of GTEST_SHUFFLE

Fix failing tests using seeds generated in the run: https://jenkins.isc.org/job/kea-dev/job/ut-basic/52

seed on fedora: 92727
seed on debian: 24338
seed on ubuntu: 11764
seed on centos: 91424

to run tests with those seeds it's needed to have env variables GTEST_SHUFFLE=1 and GTEST_SHUFFLE_SEED with SEED replaced by int.

This exercise is aimed to check if fixing those tests will resolve in fixing kea core code or just tests, if it will be just test code we will not enable GTEST_SHUFFLE in buildfarm.

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