Ignore H803 from Hacking.

H803 checks for a period in commit messages, something the community
clearly rejected as a sensible check: periods in commit messages
should neither be rejected or required.

The email thread on this issue is here:

http://lists.openstack.org/pipermail/openstack-dev/2013-June/010837.html

Change-Id: I754e10ca01b3e6f8c6482e1bcd4c2e2ca8c1cfc9
Merge "Ignore H803 from Hacking."