update to hacking 0.8

hacking 0.8 brings us a working H302 rule (should import modules
not objects) and a bunch of python 3 compat rules.

fix the python 3 compat issues to make this landable.

Change-Id: I53abf39394afc54da5ad049802dca0032f14882d
diff --git a/test-requirements.txt b/test-requirements.txt
index fbe7e43..41a784e 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,4 +1,4 @@
-hacking>=0.5.6,<0.8
+hacking>=0.8.0,<0.9
 # needed for doc build
 docutils==0.9.1
 sphinx>=1.1.2