<check-sources> Bug 1028941 - Added 1.2 repos to beta2.ini

https://bugzilla.redhat.com/show_bug.cgi?id=1028941

The 1.2 repo data was missing from beta2.ini, so version conflicts
weren't being detected.

Long term fix for this is to refactor the version guessing and add the
2.0beta channels to the ini file with an unique version

Added fix RHEL for repos priorities if they are higher than OSE repos
or >= 99