Introduce leapp data in the RPM & repository

In the past it was needed to obtain the data by
* automatic download of data files from RH Insights
  (cloud.redhat.com)
  - which required access to the server & have the system registered
* manual download from the article:
    https://access.redhat.com/articles/3664871
  which required to login to the portal, download the archive
  and install its content manually on the system

Additional problem was with the syncing of data, as because of the
separation of data from the code, people had ensure they are
using the right combination of data and SW manually - in case the
data has not been downloaded automatically from RH Insights.

Having the data in the RPM makes our lives easier so let's install
them to `/etc/leapp/files/` via the package directly.

Keeping original functionality still available, so if people remove
the files from the system, data can be still downloaded from the
server automatically. It seems it does not make sense, but we could
still use the possibility to download more up-to-date data from
RH Insights.

Author: pirat89