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privcand test is unstable #1810

@jktjkt

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@jktjkt

This test tends to fail at times in our CI, especially when run with TSAN (which, in general, "makes the code run slower", and our CI runs all tests in parallel on a "big VM"). Here's one such failure (full output):

16/19 Test #18: test_privcand ....................Subprocess aborted***Exception:   7.25 sec
[==========] tests: Running 13 test(s).
[ RUN      ] test_pc_copy_config
[       OK ] test_pc_copy_config
[ RUN      ] test_pc_update_rpc
[       OK ] test_pc_update_rpc
[ RUN      ] test_pc_validate
[       OK ] test_pc_validate
[ RUN      ] test_pc_nmda_rpcs
[       OK ] test_pc_nmda_rpcs
[ RUN      ] test_pc_lock_unlock
[       OK ] test_pc_lock_unlock
[ RUN      ] test_pc_basic_commit
[       OK ] test_pc_basic_commit
[ RUN      ] test_pc_commit_timeout_runout
Session 2 [ERR]: Communication file descriptor (10) unexpectedly closed.
0x8 != 0
[   LINE   ] --- /home/ci/src/cesnet-gerrit-public/CzechLight/dependencies/netopeer2/tests/test_privcand.c:461: error: Failure!

Our test runner is capturing the individual np2.log files from the test directory, here's the relevant one. I don't see any error in any of the logs, including the syslog.

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