fix the sed extression that filters out version number sot it does not
strip out the `-pine64` part of string.

  apk fetch  --simulate --root --recursive u-boot-all

* Modernize.
* Move to community.

* Switch source to github as it provides a test suite.
* Since pytest4 no longer supports the _pytest.mark.parametrize_ function call,
  some tests will fail. Import patch from fedora to enable compatibility with
  pytest4.