<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
Merge pull request #174 from dobbymoodge/BZ1028941

<check-sources> Bug 1028941 - Added 1.2 repos to beta2.ini
<yum-validator> Rename assets from *check-sources to *yum-validator

This set of changes prepares the code base for the next step, which is
reorganization for packaging. Changes include:

* `oo-admin-check-sources.py` is renamed to `oo_admin_yum_validator.py`
    * This will eventually be called from a wrapper script -
      `/usr/sbin/oo-admin-yum-validator` - to maintain consistency of
      naming with other `oo-admin-*` scripts
* Towards implementing a wrapper script, the main program logic for
  `oo_admin_yum_validator.py` is now in the module function
  `validate_yum`
* Class `OpenShiftAdminCheckSources` is converted to a new-style class
  named `OpenShiftYumValidator`
* Class `OpenShiftCheckSources` is converted to a new-style class
  named `CheckSources`
add symlinks to keep old instructions from breaking
Merge pull request #175 from dobbymoodge/yum-validator

<yum-validator> Rename assets from *check-sources to *yum-validator