Disable neutron quotas when using fake virt driver

Nova's fake virt driver, can be used to do scale testing, so when using
it disable neutron's quota limits.

Change-Id: I9ce995079af04202179820777217ef294df71226
Move RHEL6 hacks to tools/fixup_stuff.sh

Change-Id: Ice983bc16379bc2bc25659c37cfc16b63fdfc34b
Merge "Disable neutron quotas when using fake virt driver"
Merge "Move RHEL6 hacks to tools/fixup_stuff.sh"
Merge branch 'master' of github.com:openstack-dev/devstack