test: flaky replication/show_error_on_disconnect.test.lua test

[avtikhon]

Tarantool version:
Tarantool 2.6.0-129-gd25ecab48
Target: Darwin-x86_64-RelWithDebInfo
Build options: cmake . -DCMAKE_INSTALL_PREFIX=/usr/local -DENABLE_BACKTRACE=ON
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 14/15

Bug description:
https://gitlab.com/tarantool/tarantool/-/jobs/766469631#L3929
https://gitlab.com/tarantool/tarantool/-/jobs/768971485#L5829
https://gitlab.com/tarantool/tarantool/-/jobs/768931850#L4159

artifacts.zip

results file checksum: 304214225ce2a0238cc583059733f73a

Segmentation fault
  code: SEGV_MAPERR
  addr: 0x2974656c13
  context: 0x1103ffca0
  siginfo: 0x1103ffc38
Current time: 1601504396
Please file a bug at http://github.com/tarantool/tarantool/issues
Attempting backtrace... Note: since the server has already crashed, 
this may fail as well
#0  0x10c06fb39 in print_backtrace+9
tarantool/tarantool#1  0x10bf11288 in _ZL12sig_fatal_cbiP9__siginfoPv+158
tarantool/tarantool#2  0x7fff723ecb5d in _sigtramp+1d
[023] 
[023] [Instance "master_quorum1" killed by signal: 6 (SIGABRT)]

Steps to reproduce:

Optional (but very desirable):

• coredump
• backtrace
• netstat