Fix badly named function typo

It's load_config, not load_config_from_file.

Change-Id: I2daddaf036a201a0e61acddf33f52916f7a99148
diff --git a/zuul/cmd/__init__.py b/zuul/cmd/__init__.py
index f677b5e..5d8fb08 100755
--- a/zuul/cmd/__init__.py
+++ b/zuul/cmd/__init__.py
@@ -84,7 +84,7 @@
     def setup_logging(self, section, parameter):
         if self.config.has_option(section, parameter):
             fp = os.path.expanduser(self.config.get(section, parameter))
-            logging_config = logconfig.load_config_from_file(fp)
+            logging_config = logconfig.load_config(fp)
         else:
             # If someone runs in the foreground and doesn't give a logging
             # config, leave the config set to emit to stdout.