Add possibility to configure connection options in MQTT output plugin

[tbarthelet]

Hi,
When connecting to an external MQTT broker, additional information is usually required on top of broker url and port, like credentials for example.
It would be great to be able to pass the "options" object in the MQTT output plugin configuration which would be taken into account by the mqtt.connect function according to the mqtt.js doc:
https://www.npmjs.com/package/mqtt#client

[megastef]

Hi, it makes sense to add all options to the config.
What happens when you add credentials in the URL? e.g.

mqtt://user:[email protected]:1883

This could be a workaround until we have a new release.

[megastef]

Changes are made in commit 186930b

Please try by installing logagent from git sudo npm install -g https://github.com/sematext/logagent-js.git before we make a new release.

[tbarthelet]

It works great. Thank you very much for the quick fix!