test: flaky replication/on_replace.test.lua test

[avtikhon]

Tarantool version:
Tarantool 2.6.0-115-ge19b392f0
Target: Darwin-x86_64-RelWithDebInfo
Build options: cmake . -DCMAKE_INSTALL_PREFIX=/Users/tntmac04.tarantool.i/builds/PVWCJs8U/0/tarantool/tarantool/static-build/tarantool-prefix -DENABLE_BACKTRACE=TRUE
Compiler: /Library/Developer/CommandLineTools/usr/bin/cc /Library/Developer/CommandLineTools/usr/bin/c++
C_FLAGS: -Wno-unknown-pragmas -fexceptions -funwind-tables -fno-omit-frame-pointer -fno-stack-protector -fno-common -msse2 -std=c11 -Wall -Wextra -Wno-strict-aliasing -Wno-char-subscripts -Wno-gnu-alignof-expression -Werror
CXX_FLAGS: -Wno-unknown-pragmas -fexceptions -funwind-tables -fno-omit-frame-pointer -fno-stack-protector -fno-common -msse2 -std=c++11 -Wall -Wextra -Wno-strict-aliasing -Wno-char-subscripts -Wno-invalid-offsetof -Wno-gnu-alignof-expression -Werror

OS version:
OSX 14

Bug description:
https://gitlab.com/tarantool/tarantool/-/jobs/759678147#L4928

artifacts.zip

results file checksum: a4bfe23bccfe95a314ebb61695f30e80

[049] --- replication/on_replace.result	Sat Sep 26 23:14:14 2020
[049] +++ replication/on_replace.reject	Sun Sep 27 22:16:26 2020
[049] @@ -213,7 +213,7 @@
[049]  ...
[049]  s3:select()
[049]  ---
[049] -- - [1, 2, 3, 4]
[049] +- []
[049]  ...
[049]  _ = test_run:cmd('switch default')
[049]  ---
[049] 

Steps to reproduce:

Optional (but very desirable):

• coredump
• backtrace
• netstat