Udi-interface

- Trap JSONDecodeError when parsing nsdata
- Don't report drivers if there are none
- Fixed typo in oAuth sample code

- Enhance Custom class get method: Allow to pass a default value

- Ensure the interface does not use paho-mqtt version 2
- Don't load server.json if we don't need it.

- Added methods to update and get oAuth parameters
- OAuth class is now included in the interface
- Custom class now has an update method (in addition to load)
- Custom handling has been refactored to support oAuth parameters updated by the plugin
- setDriver now returns a flag indicating if the value is different than before
- Updated oAuth doc

- Revert SSL error retries from 3.2.5. This did not help as when there is an SSL publish error, the connection drops.

- When an SSL error is encountered during publishing, retry up to 3 times