Fix file permissions for some ydb tests.#446

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prohaska7 wants to merge 3 commits intopercona:masterfrom

prohaska7:may2020-ydb-test-fails-due-to-file-permissions

Commits on Apr 11, 2020

glibc 2.30 defines the gettid system call, which conflicts with the
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Commits on May 22, 2020

Build with gcc-10.0.1 (unbuntu 20.04). When cmake is probing for language specific flag support
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Fix ydb tests that fail due to loose file permissions. Note that file permissions were changed in commit 5aca29f.
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