Fix the test_network_limit_time* tests

[apolukhin]

At the moment those tests are disabled as flacky

userver/postgresql/functional_tests/basic_chaos/tests/test_postgres.py

Lines 172 to 224 in 4348f91

	@pytest.mark.skip(reason='flacky')
	async def test_network_limit_time_sends(service_client, gate):
	gate.to_server_limit_time(CONNECTION_TIME_LIMIT, CONNECTION_LIMIT_JITTER)
	logger.debug('Starting "test_network_limit_time_sends" check for 500')
	got_error = False
	for _ in range(FAILURE_RETRIES):
	response = await service_client.get(SELECT_SMALL_TIMEOUT_URL)
	if response.status != 200:
	got_error = True
	break
	logger.debug('End of "test_network_limit_time_sends" check for 500')
	assert got_error, 'Previous steps unexpectedly finished with success'
	await _check_that_restores(service_client, gate)
	@pytest.mark.skip(reason='flacky')
	async def test_network_limit_time_recv(service_client, gate):
	gate.to_client_limit_time(CONNECTION_TIME_LIMIT, CONNECTION_LIMIT_JITTER)
	logger.debug('Starting "test_network_limit_time_recv" check for 500')
	got_error = False
	for _ in range(FAILURE_RETRIES):
	response = await service_client.get(SELECT_SMALL_TIMEOUT_URL)
	if response.status != 200:
	got_error = True
	break
	logger.debug('End of "test_network_limit_time_recv" check for 500')
	assert got_error, 'Previous steps unexpectedly finished with success'
	await _check_that_restores(service_client, gate)
	@pytest.mark.skip(reason='flacky')
	async def test_network_limit_time(service_client, gate):
	gate.to_server_limit_time(CONNECTION_TIME_LIMIT, CONNECTION_LIMIT_JITTER)
	gate.to_client_limit_time(CONNECTION_TIME_LIMIT, CONNECTION_LIMIT_JITTER)
	logger.debug('Starting "test_network_limit_time" check for 500')
	got_error = False
	for _ in range(FAILURE_RETRIES):
	response = await service_client.get(SELECT_SMALL_TIMEOUT_URL)
	if response.status != 200:
	got_error = True
	break
	logger.debug('End of "test_network_limit_time" check for 500')
	assert got_error, 'Previous steps unexpectedly finished with success'
	await _check_that_restores(service_client, gate)

Restore the tests and make them reliable

Internal ticket: 7988