Add switch that disables repo installation

[florian-asche]

Hi, on some systems the repo installation failed due to the non existent packages for that distribution or system version. Also it would be cool to disable dev repo and use production instead.

Example:

TASK [sansible.mosquitto : Add Mosquitto repository] ********************************************************************************
fatal: [newfhem]: FAILED! => {"changed": false, "msg": "Failed to update apt cache: E:The repository 'http://ppa.launchpad.net/mosquitto-dev/mosquitto-ppa/ubuntu stretch Release' does not have a Release file."}

I added a switch for that in this PR. Feel free to merge this to development for automated testing and move it to production.

[florian-asche]

I hope it is ok, that i also added another change in this PR. I made it possible to change the destination for the configuration file. The default configuration file has some values for example persistence. I cannot change that with the sub configuration because its duplicated then. This way i can choose what i want to do.