Enable hacking-extensions H204, H205

This patch enable extensions:
-[H204] Use assert(Not)Equal to check for equality.
-[H205] Use assert(Greater|Less)(Equal) for comparison.

Change-Id: If1b09426deba024ce75ee0d2d687c2501a1e141d

tox.ini

@@ -105,7 +105,9 @@ exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,tools
 # [H904] Delay string interpolations at logging calls
 # [H106] Don’t put vim configuration in source files
 # [H203] Use assertIs(Not)None to check for None.
-enable-extensions=H904,H106,H203
+# [H204] Use assert(Not)Equal to check for equality
+# [H205] Use assert(Greater|Less)(Equal) for comparison
+enable-extensions=H904,H106,H203,H204,H205
 
 [hacking]
 import_exceptions = sahara.i18n