Enable all checks during integration test

When testing trunk hacking against projects we want to see the results
for all checks. To make the output easier to understand, also enable
statistics output at the end, so one can quickly see if there is any
change in the numbers

Change-Id: Ic80083a5605a988aae75c20df924eced8674ef1f
update HACKING.rst to be OpenStack Style Commandments

Remove anything that isn't a style commandment
Replace openstack-common references with oslo-incubator
Generalize some references to nova

Change-Id: I9256ac80855f4d5ff2cd457f5f4a04a3e2d38dee
Merge "update HACKING.rst to be OpenStack Style Commandments"