Updated openstack/openstack
Project: openstack/tempest  816131c2a067084c6c0e62670e94eccc8e6aa794

Fixes grammatical errors in HACKING.rst

There are a few lines in HACKING.rst that were incorrect
grammatically. This fix changes those.

Change-Id: I8173dae3cf3a3e78a504b4edd4a7c1ff5b7fb9a4
Closes-Bug: #1389603