[Enforce-TLS]: Support cbepctl usage over memcached ssl port

# /opt/couchbase/bin/cbepctl localhost:11207 -u Administrator -p password start

Traceback (most recent call last):

  File "/opt/couchbase/lib/python/cbepctl", line 368, in <module>

    c.execute()

  File "/opt/couchbase/lib/python/clitool.py", line 83, in execute

    f[0](mc, *args[2:], **opts.__dict__)

  File "/opt/couchbase/lib/python/cli_auth_utils.py", line 79, in g

    mc.sasl_auth_plain(username, password)

  File "/opt/couchbase/lib/python/mc_bin_client.py", line 488, in sasl_auth_plain

    return self.sasl_auth_start('PLAIN', '\0'.join([foruser, user, password]))

  File "/opt/couchbase/lib/python/mc_bin_client.py", line 484, in sasl_auth_start

    return self._doCmd(memcacheConstants.CMD_SASL_AUTH, mech, data)

  File "/opt/couchbase/lib/python/mc_bin_client.py", line 303, in _doCmd

    return self._handleSingleResponse(opaque)

  File "/opt/couchbase/lib/python/mc_bin_client.py", line 296, in _handleSingleResponse

    cmd, opaque, cas, keylen, extralen, data = self._handleKeyedResponse(myopaque)

  File "/opt/couchbase/lib/python/mc_bin_client.py", line 281, in _handleKeyedResponse

    cmd, errcode, opaque, cas, keylen, extralen, rv = self._recvMsg()

  File "/opt/couchbase/lib/python/mc_bin_client.py", line 250, in _recvMsg

    data = self._socketRecv(MIN_RECV_PACKET - len(response))

  File "/opt/couchbase/lib/python/mc_bin_client.py", line 244, in _socketRecv

    return self.s.recv(amount)

ConnectionResetError: [Errno 104] Connection reset by peer