Revert "Allow specifying the configuration file name at the parser's class level. Refs #2563."

This reverts commit 3055916b5ddcea62885a637c3a26a4e7d75b6107.
Merge pull request #3779 from basepi/nominions

Fix errors in Pull Request #3777
Fix minor spelling issue
extension sp
typo fix. added example of unrestricted access.
added salt_token filename
Use salt.utils.winapi.Com instead of manually
To avoid any future confusion, we'll use `__load__` instead of `__all__`.
Add check if bad fileserver backend is specified
Fix to properly print errors from cli.run()
Merge pull request #3784 from basepi/autherrorfix

Fixes #3760 Fix to properly print errors from cli.run()
Merge pull request #3783 from UtahDave/use_winapi-please

Use salt.utils.winapi.Com instead of manually running the pythoncom stuff
move dict definition outside loop
Create pkg list with pkg_resource.add_pkg
Fix a pep8 line length issue
proper use of add_pkg
Don't forget function parens
Merge pull request #3785 from UtahDave/use_winapi-please

win_pkg should use pkg_resource.add_pkg
Sort packages before returning
Re-apply 3055916b5ddcea62885a637c3a26a4e7d75b6107 correcting the copy/paste error. Refs #2563.

We should now provide the configuration filename to load configurations from at the parser's class level.
The calls to `ConfigDirMixIn.get_config_file_path()` still accept a filename, though, if that filename is `None`(the default), it grabs the filename from the class level attribute `_config_filename_`.