Start using Pyflakes and Hacking

Instead of globally ignoring pyflakes and
hacking warnings, only blacklist those that trigger
very frequently so far, in order to clean them
up in followup commits. Fix and start gating
on the rest already.

Change-Id: Ied7c7250061e3bf379e8286e8ce3b9e4af817faf

glanceclient/common/http.py

@@ -145,8 +145,7 @@ class HTTPClient(object):
 
     @staticmethod
     def encode_headers(headers):
-        """
-        Encodes headers.
+        """Encodes headers.
 
         Note: This should be used right before
         sending anything out.
@@ -159,7 +158,7 @@ class HTTPClient(object):
         return dict([(to_str(h), to_str(v)) for h, v in headers.iteritems()])
 
     def _http_request(self, url, method, **kwargs):
-        """ Send an http request with the specified characteristics.
+        """Send an http request with the specified characteristics.
 
         Wrapper around httplib.HTTP(S)Connection.request to handle tasks such
         as setting headers and error handling.