Update to latest hacking

Update the version of hacking being used to the kilo release version and
update the source to fix issues with the new tests.

Change-Id: Ib9e5ac41dc7f714edc5f819f0e9cd114890ac3ca

oslo_log/handlers.py

@@ -66,4 +66,4 @@ class ColorHandler(logging.StreamHandler):
 
     def format(self, record):
         record.color = self.LEVEL_COLORS[record.levelno]
-        return logging.StreamHandler.format(self, record)
+        return logging.StreamHandler.format(self, record)

oslo_log/loggers.py

@@ -21,4 +21,4 @@ class WritableLogger(object):
         self.level = level
 
     def write(self, msg):
-        self.logger.log(self.level, msg.rstrip())
+        self.logger.log(self.level, msg.rstrip())

test-requirements.txt

@@ -2,7 +2,7 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
-hacking>=0.9.1,<0.10
+hacking>=0.10.0,<0.11
 
 discover
 fixtures>=0.3.14