More PEP8 fixes that were introduced in the last couple commits.

nova/utils.py

@@ -213,10 +213,10 @@ def deferredToThread(f):
 
 def xhtml_escape(value):
     """Escapes a string so it is valid within XML or XHTML.
-    
+
     Code is directly from the utf8 function in
     http://github.com/facebook/tornado/blob/master/tornado/escape.py
-    
+
     """
     return saxutils.escape(value, {'"': """})
 
@@ -232,4 +232,3 @@ def utf8(value):
         return value.encode("utf-8")
     assert isinstance(value, str)
     return value
-