As there are no complains and some 
I have pushed forward with PRs. Again it is structured to:
- https://github.com/theforeman/foreman/pull/6734 - first to introduce polyfills for full support
- and https://github.com/theforeman/foreman/pull/6735 - second to introduce mounter.
In the later is a snippet how to use the new mounter. I believe we should get more reliable and more convenient mounting support.
Any comments or suggestions how to improve the code are appreciated! 