cli: Make cachemaker.py pep8 compliant

Fixes object comparision to use a "is" b instead of ==

Signed-off-by: Rohit Yadav <bhaisaab@apache.org>

tools/cli/cloudmonkey/cachemaker.py

@@ -101,7 +101,7 @@ def monkeycache(apis):
     cache['asyncapis'] = []
 
     apilist = getvalue(apis[responsekey], 'api')
-    if apilist == None:
+    if apilist is None:
         print "[monkeycache] Server response issue, no apis found"
 
     for api in apilist: