test: flaky replication/qsync_with_anon.test.lua test

[avtikhon]

Tarantool version:
| Tarantool 2.7.0-74-g489c46bdd4
| 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 -fprofile-arcs -ftest-coverage -std=c11 -Wall -Wextra -Wno-strict-aliasing -Wno-char-subscripts -Wno-format-truncation -Wno-gnu-alignof-expression -fno-gnu89-inline -Wno-cast-function-type -Werror
| CXX_FLAGS: -fexceptions -funwind-tables -fno-omit-frame-pointer -fno-stack-protector -fno-common -fopenmp -msse2 -fprofile-arcs -ftest-coverage -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 -Werror

OS version:
Debian 9

Bug description:
https://gitlab.com/tarantool/tarantool/-/jobs/875323301#L3760

artifacts.zip

results file checksum: 9b4dfde7e23f265ffb9eb750c273262e

[003] replication/qsync_with_anon.test.lua            vinyl           
[003] [Instance "anon1"] Tarantool server failed to start
[003] 
[003] Last 15 lines of Tarantool Log file [Instance "anon1"][/builds/WHBm2_Sk/0/tarantool/tarantool/test/var/003_replication/anon1.log]:
[003] Starting instance anon1...
[003] Run console at unix/:/builds/WHBm2_Sk/0/tarantool/tarantool/test/var/003_replication/anon1.control
[003] started
[003] mkdir /builds/WHBm2_Sk/0/tarantool/tarantool/test/var/003_replication/anon1
[003] 2020-11-26 17:24:53.408 [15571] main/103/anon1 C> Tarantool 2.7.0-74-g489c46bdd4
[003] 2020-11-26 17:24:53.408 [15571] main/103/anon1 C> log level 5
[003] 2020-11-26 17:24:53.408 [15571] main/103/anon1 I> mapping 117440512 bytes for memtx tuple arena...
[003] 2020-11-26 17:24:53.408 [15571] main/103/anon1 I> mapping 134217728 bytes for vinyl tuple arena...
[003] 2020-11-26 17:24:53.422 [15571] main/103/anon1 I> instance uuid 5e8c7461-3353-4857-8369-94df42746584
[003] 2020-11-26 17:24:53.422 [15571] iproto/101/main I> binary: bound to unix/:(socket)
[003] 2020-11-26 17:24:53.422 [15571] main/103/anon1 I> connecting to 1 replicas
[003] 2020-11-26 17:24:53.943 [15571] main/103/anon1 C> failed to connect to 1 out of 1 replicas
[003] 2020-11-26 17:24:53.944 [15571] main/103/anon1 replication.cc:747 E> ER_CFG: Incorrect value for option 'replication': failed to connect to one or more replicas
[003] 2020-11-26 17:24:53.944 [15571] main/103/anon1 F> can't initialize storage: Incorrect value for option 'replication': failed to connect to one or more replicas
[003] 2020-11-26 17:24:53.944 [15571] main/103/anon1 F> can't initialize storage: Incorrect value for option 'replication': failed to connect to one or more replicas
[003] 
[003] [Instance "master"] Failed to start tarantool instance "anon1"
[003] [ fail ]

Steps to reproduce:

Optional (but very desirable):

• coredump
• backtrace
• netstat