gss unit tests failures

We have some unit tests failures on non standard builds.

Thread sanitiser: https://jenkins.aws.isc.org/job/kea-dev/job/ut-tsan/831/
- CXXFLAGS = "-g3 -ggdb -O0 -fsanitize=thread -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches"
- list of failures: https://jenkins.aws.isc.org/job/kea-dev/job/ut-tsan/831/testReport/junit/(root)/
undefined behaviour https://jenkins.aws.isc.org/job/kea-dev/job/ut-ubsan/423/
- CXXFLAGS = "-g3 -ggdb -O0 -fsanitize=undefined -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches"
- list of failures: https://jenkins.aws.isc.org/job/kea-dev/job/ut-ubsan/423/testReport/

Edited Jan 05, 2023 by Wlodzimierz Wencel

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