Make distro_info return an integer for version

Make distro_info task return an integer for os version.

Also fix os version check when checking if should install abrt plugin or
not on the provision_install task.
@Ichimonji10 I'm not asking for an explanation as to how ``re`` works but a simple explanation of the **output** so that it is easier to understand why we're splitting things and looking up the ``0`` item. The whole purpose of this PR is to fix the fact that we were looking at the wrong positional item, right? :) My point being, show me what the output is and why we want to do this.

Now, I understand that ``match.group`` could return something like:
* 6.6
* 20
* 7.1

With this information in hand I can see why we want to ``split('.')`` to obtain the major version, but will I remember this say 2 weeks from now? Will anyone? :)