CP Minimqtt: possible issue with connect() retry always throwing an exception after one failed attempt

[T-Mosher]

For full details, please see this Forum thread:
https://forums.adafruit.com/viewtopic.php?p=1083496#p1083496

Short version:
Note that _reconnect_attempts_max value is initialized by the constructor to 5, from by the default value for connect_retries.

[T-Mosher]

This may be related to this issue:
#211

...particularly the first type of exception - as copied here: