Fix dictionary logging in formatter

Python special cases single Mapping arguments to logging. This
adjusts BaseFormatter to skip "fancy" formatting if argument
is of type Mapping. Also adds various formatted log outputs.

pelican/tests/support.py

@@ -195,6 +195,15 @@ class LogCountHandler(BufferingHandler):
                (level is None or l.levelno == level)
         ])
 
+    def count_formatted_logs(self, msg=None, level=None):
+        return len([
+            l
+            for l
+            in self.buffer
+            if (msg is None or re.search(msg, self.format(l))) and
+               (level is None or l.levelno == level)
+        ])
+
 
 class LoggedTestCase(unittest.TestCase):
     """A test case that captures log messages."""