test: flaky app-tap/http_client.test.lua test hangs

[avtikhon]

Tarantool version:
| Tarantool 2.7.0-84-g6225d7fe4
| 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

Bug description:
https://gitlab.com/tarantool/tarantool/-/jobs/877383261#L4670

artifacts.zip

results file checksum: 52622501dc6895d779029beaea91924a

[096] app-tap/http_client.test.lua                                    Test timeout of 110 secs reached	[ fail ]
[096] Test failed! Output from reject file /tmp/tnt/rejects/app-tap/http_client.reject:
[096] TAP version 13
[096] # TARANTOOL_SRC_DIR=/Users/tntmac04.tarantool.i/builds/PVWCJs8U/0/tarantool/tarantool
[096] 1..2
[096]     # http over AF_INET
[096]     1..11
[096]     # starting HTTP server on 127.0.0.1:53911...
[096] 

Steps to reproduce:

Optional (but very desirable):

• coredump
• backtrace
• netstat