test: box-py/snapshot test flaky fails on static build

[avtikhon]

Tarantool version:

OS version:

Bug description:

[049] box-py/snapshot.test.py                                         [ fail ]
[049] 
[049] Test failed! Result content mismatch:
[049] --- box-py/snapshot.result	Fri Sep 20 08:41:41 2019
[049] +++ box-py/snapshot.reject	Fri Sep 20 08:46:05 2019
[049] @@ -53,7 +53,7 @@
[049]  ---
[049]  - [1, 'Test tuple']
[049]  ...
[049] -Snapshot exists.
[049] +Snapshot is missing.
[049]  space:drop()
[049]  ---
[049]  ...
[049] 
[049] Last 15 lines of Tarantool Log file [Instance "box"][/tarantool/test/var/049_box-py/box.log]:

Steps to reproduce:
https://gitlab.com/tarantool/tarantool/-/jobs/299884253
https://gitlab.com/tarantool/tarantool/-/jobs/299400368

Optional (but very desirable):

• coredump
• backtrace
• netstat

[avtikhon]

Reproduced on 2.4.0-16-gcdf502c

[ligurio]

Passed 1000 times out of 1000 runs, hardware: mcs1.

Tarantool 2.4.0-90-g362d59784
Target: Linux-x86_64-Debug
Build options: cmake . -DCMAKE_INSTALL_PREFIX=/usr/local -DENABLE_BACKTRACE=ON
Compiler: /usr/bin/cc /usr/bin/c++
C_FLAGS: -fexceptions -funwind-tables -fno-omit-frame-pointer -fno-stack-protector -fno-common -fopenmp -msse2 -std=c11 -Wall -Wextra -Wno-strict-aliasing -Wno-char-subscripts -Wno-format-truncation -fno-gnu89-inline -Wno-cast-function-type -Werror
CXX_FLAGS: -fexceptions -funwind-tables -fno-omit-frame-pointer -fno-stack-protector -fno-common -fopenmp -msse2 -std=c++11 -Wall -Wextra -Wno-strict-aliasing -Wno-char-subscripts -Wno-format-truncation -Wno-invalid-offsetof -Wno-cast-function-type -Werror

[avtikhon]

Unfortunately it is really often reproducible, please check gitlab-ci results like:
https://gitlab.com/tarantool/tarantool/-/jobs/515483821