Remove dead code path using cached password

Only the token is actually being stored, which is obtained either from the user entering it or by exchanging a user-entered password (and possibly a 2FA code) for a token.

gitsome/config.py

@@ -180,12 +180,8 @@ def authenticate_cached_credentials(self, config, parser):
                     token=self.user_token,
                     two_factor_callback=self.request_two_factor_code)
             except configparser.NoOptionError:
-                self.user_pass = parser.get(self.CONFIG_SECTION,
-                                            self.CONFIG_USER_PASS)
-                self.api = self.login(
-                    username=self.user_login,
-                    password=self.user_pass,
-                    two_factor_callback=self.request_two_factor_code)
+                self.print_auth_error()
+                return
             try:
                 self.user_feed = parser.get(self.CONFIG_SECTION,
                                             self.CONFIG_USER_FEED)
@@ -502,9 +498,6 @@ def save_config(self):
             parser.set(self.CONFIG_SECTION,
                        self.CONFIG_USER_LOGIN,
                        self.user_login)
-            parser.set(self.CONFIG_SECTION,
-                       self.CONFIG_USER_PASS,
-                       self.user_pass)
             parser.set(self.CONFIG_SECTION,
                        self.CONFIG_USER_TOKEN,
                        self.user_token)