lib_openshift oc file lookup improvements

- Move binary file search to separate method called from constructor
- Use six.PY3 instaed of sys.version_info
- Combine additional paths with the paths from the environment
  - For py3 pass the combined paths to shutil.which
  - For py2 explictly search for existance of file from combined paths
    instead of using distutils.spawn.find_executable and falling back
- Use 'oc adm' instead of 'oadm'

- Fix generate_validation test issue
- fix tests for oc binary location
- add tests for file lookup

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