Convert config to oslo_config

This patch is the initial conversion of the custom config
and config file yaml format to oslo_config's configuration mechanism.

The resulting config format is now an ini type file.

The default location is ~/.config/aprsd/aprsd.conf

This is a backwards incompatible change.  You will have to rebuild
the config file and edit it.

Also any aprsd plugins can now define config options in code and
add an setup.cfg entry_point definition
oslo_config.opts  =
  foo.conf = foo.conf:list_opts

tests/test_email.py

@@ -5,21 +5,20 @@ from aprsd.plugins import email
 
 class TestEmail(unittest.TestCase):
     def test_get_email_from_shortcut(self):
-        config = {"aprsd": {"email": {"shortcuts": {}}}}
         email_address = "something@something.com"
         addr = f"-{email_address}"
-        actual = email.get_email_from_shortcut(config, addr)
+        actual = email.get_email_from_shortcut(addr)
         self.assertEqual(addr, actual)
 
         config = {"aprsd": {"email": {"nothing": "nothing"}}}
-        actual = email.get_email_from_shortcut(config, addr)
+        actual = email.get_email_from_shortcut(addr)
         self.assertEqual(addr, actual)
 
         config = {"aprsd": {"email": {"shortcuts": {"not_used": "empty"}}}}
-        actual = email.get_email_from_shortcut(config, addr)
+        actual = email.get_email_from_shortcut(addr)
         self.assertEqual(addr, actual)
 
         config = {"aprsd": {"email": {"shortcuts": {"-wb": email_address}}}}
         short = "-wb"
-        actual = email.get_email_from_shortcut(config, short)
+        actual = email.get_email_from_shortcut(short)
         self.assertEqual(email_address, actual)

tests/test_main.py

@@ -17,6 +17,6 @@ class TestMain(unittest.TestCase):
         """Test to make sure we fail."""
         imap_mock.return_value = None
         smtp_mock.return_value = {"smaiof": "fire"}
-        config = mock.MagicMock()
+        mock.MagicMock()
 
-        email.validate_email_config(config, True)
+        email.validate_email_config(True)