[BUG]: multiple TLS tests fail on 2nd test due to tls cert/key filenames being replaced

[filipecosta90]

Describe the bug

2022-02-09 08:23:35 INFO Tearing down setup
2022-02-09 08:23:35 INFO Given that TLS is enabled, appending -tls to the testname: memtier_benchmark-1Mkeys-load-list-with-100B-values-tls.
2022-02-09 08:23:35 CRITICAL Some unexpected exception was caught during local work. Failing test....
2022-02-09 08:23:35 CRITICAL <class 'redis.exceptions.ConnectionError'>
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Traceback (most recent call last):
  File "/usr/local/lib/python3.6/dist-packages/redis/connection.py", line 559, in connect
    sock = self._connect()
  File "/usr/local/lib/python3.6/dist-packages/redis/connection.py", line 858, in _connect
    keyfile=self.keyfile)
FileNotFoundError: [Errno 2] No such file or directory

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/dist-packages/redis_benchmarks_specification/__runner__/runner.py", line 247, in process_self_contained_coordinator_stream
    r.ping()
  File "/usr/local/lib/python3.6/dist-packages/redis/client.py", line 1378, in ping
    return self.execute_command('PING')
  File "/usr/local/lib/python3.6/dist-packages/redis/client.py", line 898, in execute_command
    conn = self.connection or pool.get_connection(command_name, **options)
  File "/usr/local/lib/python3.6/dist-packages/redis/connection.py", line 1192, in get_connection
    connection.connect()
  File "/usr/local/lib/python3.6/dist-packages/redis/connection.py", line 563, in connect
    raise ConnectionError(self._error_message(e))
redis.exceptions.ConnectionError: Error 2 connecting to 172.31.59.178:6380. No such file or directory.
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2022-02-09 08:23:35 INFO Tearing down setup