test: flaky vinyl/ddl.test.lua test

[avtikhon]

Tarantool version:
Tarantool 1.10.7-38-gff7a8ce52
Target: Linux-x86_64-RelWithDebInfo
Build options: cmake . -DCMAKE_INSTALL_PREFIX=/usr -DENABLE_BACKTRACE=OFF
Compiler: /usr/bin/cc /usr/bin/c++
C_FLAGS:-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -fexceptions -funwind-tables -fno-common -fopenmp -msse2 -std=c11 -Wall -Wextra -Wno-strict-aliasing -Wno-char-subscripts -Wno-format-truncation -Wno-gnu-alignof-expression -fno-gnu89-inline -Wno-cast-function-type
CXX_FLAGS:-O2 -g -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -fexceptions -fstack-protector-strong -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -fexceptions -funwind-tables -fno-common -fopenmp -msse2 -std=c++11 -Wall -Wextra -Wno-strict-aliasing -Wno-char-subscripts -Wno-format-truncation -Wno-invalid-offsetof -Wno-gnu-alignof-expression -Wno-cast-function-type

OS version:
Linux (CentOS 8)

Bug description:
https://gitlab.com/tarantool/tarantool/-/jobs/758080804#L2165

artifacts.zip

results file checksum: 6df64ebe4780edf2c7b46777b809efdc

[090] --- vinyl/ddl.result	Fri Sep 25 17:30:52 2020
[090] +++ vinyl/ddl.reject	Fri Sep 25 17:35:22 2020
[090] @@ -742,7 +742,7 @@
[090]  ...
[090]  box.space.test.index.pk:count() == box.space.test.index.sk:count()
[090]  ---
[090] -- true
[090] +- false
[090]  ...
[090]  box.space.test.index.pk:count() == box.space.test.index.tk:count()
[090]  ---
[090] @@ -751,7 +751,7 @@
[090]  test_run:cmd("restart server default")
[090]  box.space.test.index.pk:count() == box.space.test.index.sk:count()
[090]  ---
[090] -- true
[090] +- false
[090]  ...
[090]  box.space.test.index.pk:count() == box.space.test.index.tk:count()
[090]  ---
[090] @@ -763,7 +763,7 @@
[090]  ...
[090]  box.space.test.index.pk:count() == box.space.test.index.sk:count()
[090]  ---
[090] -- true
[090] +- false
[090]  ...
[090]  box.space.test.index.pk:count() == box.space.test.index.tk:count()
[090]  ---
[090] 

Steps to reproduce:

Optional (but very desirable):

• coredump
• backtrace
• netstat