pip_install_wheel: improve wheel handling

- replace python3 prefix when guessing the wheel name
  as there are still plenty of recipes out there that do use
  python3 prefixes
- remove all previously generated wheels matching the glob
  to avoid installing any outdated blob via cleandirs
  in setuptools3 class.
  Unfortunetaly proposed dist-dir or bdist-dir are not
  respected by setuptools, likely due because they
  are overridable by the setup script
- don't use PV in glob, as PV doesn't necessarily align with the
  version used inside of the setuptools configuration.
  this will avoid having the user set PYPA_WHEEL in a lot
  of recipes
- respect SETUPTOOLS_SETUP_PATH in PIP_INSTALL_DIST_PATH
  and use B as a fallback only (in case this class is inherited
  without setuptools3 class being there as well).
  recipes like python3-smbus run in a subfolder of the
  workspace and were failing in before this adjustment

Signed-off-by: Konrad Weihmann <kweihmann@outlook.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>