Added tasks for QE errata testing

Tested for the recent rhcommon errata and result is PASS.
I disagree. `if os.environ.get(...) is None` is the better comparison.

Imagine that the `ERRATA_NUMBER` environment variable is set to a value such as the empty string. As things stand, this block of code will be executed and an error will occur. On the other hand, if the less explicit comparison of `if not os.environ.get(...)` is used, then this block of code will not be executed, and no one will know that the `ERRATA_NUMBER` environment variable has a bad value.