Recycle IPs used by 'gateway' ports

Bug 1182602

Previous code simply removed IP allocation for these ports which
should never have an IP. This patch triggers IP recycling so the
IP addresses can be reused by other ports.

Change-Id: I594e02d5bbc78b219eab07e595cde713d6450ffe
Revert "Fix ./run_tests.sh --pep8"

We are explicitly trying to get rid of scripts like this and flake8 makes
this one non-necessary.
Fix run_tests.sh to run flake8 properly.

This reverts commit 42243d6eb221d52bf6f62f835726cbe026e43447

Change-Id: I435e34b6acde7931a75f456ccc88da6476581643
reference quota options in lowercase

QUOTAS section have been renamed to quotas so reference quota options in
lowercase.

fixes bug 1182772

Change-Id: Ia08cb51deacc26620e512020b6a3c3b67185ec34
Merge "Revert "Fix ./run_tests.sh --pep8""
Merge "Recycle IPs used by 'gateway' ports"