tests: Flaky strace-tst-thp-*-disabled tests

[Yury Khrustalev]

Hi everyone,

Has anyone else noticed that the elf/strace-tst-thp-*-disabled tests are
flaky producing FAIL results because madvise syscall occasionally occurs
despite using tunable glibc.elf.thp=0?

The current logic of how this tunable is handled is a bit complex, I'm
trying to pin point the reason for this, but I've seen these tests
failing from time to time with no particular pattern.

Thanks,
Yury