Upgrade paho-mqtt to 1.2.3

[fabaff]

1.2.3

• Fix possible hang of TLS connection during handshake.
• Fix issue with publish helper with TLS connection.
• Fix installation issue on non-UTF-8 system.
• Fix non-working Websocket over TLS connection.

Fixes : #7219, #7268

Tested with the following configuration:

mqtt:
  broker: localhost

binary_sensor:
  - platform: mqtt
    name: Bathroom door
    state_topic: "home/bathroom/door"
    payload_on: "1"
    payload_off: "0"
    device_class: opening

$ mosquitto_pub -h localhost -t "home/bathroom/door" -m 1
$ mosquitto_pub -h localhost -t "home/bathroom/door" -m 0

17-04-22 10:17:58 INFO (MainThread) [homeassistant.core] Bus:Handling <Event state_changed[L]: old_state=<state binary_sensor.bathroom_door=off; friendly_name=Bathroom door, device_class=opening @ 2017-04-22T10:17:13.217418+02:00>, new_state=<state binary_sensor.bathroom_door=on; friendly_name=Bathroom door, device_class=opening @ 2017-04-22T10:17:58.367423+02:00>, entity_id=binary_sensor.bathroom_door>
17-04-22 10:18:01 INFO (MainThread) [homeassistant.core] Bus:Handling <Event state_changed[L]: old_state=<state binary_sensor.bathroom_door=on; friendly_name=Bathroom door, device_class=opening @ 2017-04-22T10:17:58.367423+02:00>, new_state=<state binary_sensor.bathroom_door=off; friendly_name=Bathroom door, device_class=opening @ 2017-04-22T10:18:01.383566+02:00>, entity_id=binary_sensor.bathroom_door>

[mention-bot]

@fabaff, thanks for your PR! By analyzing the history of the files in this pull request, we identified @hmn, @balloob and @pvizeli to be potential reviewers.

[rbflurry]

+1 Fixed the mqtt startup issue for me after upgrading to 0.43.0

[hoopty]

+1 Fixed for me as well, thanks!

[balloob]

Cherry picked for 0.43.1