Fix pylint warning in http/__init__.py

My bad for not seeing this before:
R0201:614:HttpBase.GetSslCiphers: Method could be a function

Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

lib/http/__init__.py

@@ -611,7 +611,7 @@ class HttpBase(object):
 
     return OpenSSL.SSL.Connection(ctx, sock)
 
-  def GetSslCiphers(self):
+  def GetSslCiphers(self): # pylint: disable-msg=R0201
     """Returns the ciphers string for SSL.
 
     """