Start using project_id key in neutron API calls, fix
tests accordingly.
Also had to set flake8-import-order version to newer
than 0.19.0 to fix an issue with python setuptools
removing pkg_resources.
Blueprint: https://blueprints.launchpad.net/neutron/+spec/keystone-v3
Change-Id: I02e4c8cf88cdba5e8b60d0ba55a735786365b60d
Signed-off-by: Brian Haley <haleyb.dev@gmail.com>