Roman Livshits

Migrate to paho-mqtt 2

1

* addressing breaking change documented on https://github.com/eclipse/paho.mqtt.python/blob/master/docs/migrations.rst#versioned-the-user-callbacks

Allow removing tags using `-tag` syntax also in `Test Tags`

1

`Test Tags` from `*** Settings ***` and `[Tags]` from Test Case behave differently when removing tags: while it is possible to remove tags with Test Case's `[Tag] -something`, Settings `Test...