Fixes #3860 - automated discovery provisioning

Replaces https://github.com/theforeman/foreman_discovery/pull/97
> > +  # Searching must be disabled for rules otherwise query completion will not work
> 
> wait what? why do you have to *disable* search to *enable* autocompletion?

When there are two or more scoped_search components on the page, it
simply breaks and both does not work. If someone knows how to get around
it, please let me know.

-- 
Later,
 Lukas #lzap Zapletal