Update hacking version
Update hacking version

hacking version is managed in test-requirements.txt and the latest
version is 0.13.0 now.
However 0.13.0 is in very sorry shape as the Change-Id of hacking
I714caa085fa35cb4aac3b65c73a7de6d4807d04d .
So this patch updates our test-requirements.txt to avoid using
0.13.0.

Change-Id: If94186a74a022bc689d7c9c7f56f4bdb9376e8a7

Juniper/nova,gooddata/openstack-nova,klmitch/nova,gooddata/openstack-nova,openstack/nova,rajalokan/nova,openstack/nova,mikalstill/nova,rahulunair/nova,klmitch/nova,Juniper/nova,jianghuaw/nova,mahak/nova,phenoxim/nova,vmturbo/nova,vmturbo/nova,klmitch/nova,rajalokan/nova,openstack/nova,gooddata/openstack-nova,klmitch/nova,jianghuaw/nova,vmturbo/nova,jianghuaw/nova,Juniper/nova,mikalstill/nova,jianghuaw/nova,mahak/nova,vmturbo/nova,gooddata/openstack-nova,rajalokan/nova,rajalokan/nova,rahulunair/nova,Juniper/nova,mahak/nova,rahulunair/nova,mikalstill/nova,phenoxim/nova