neutron-fwaas: Add requirements for tox jobs
Related openstack-zuul-jobs change:
- periodic-newton
- periodic-ocata
- periodic-pike
- - openstack-python-jobs
- - openstack-python35-jobs
+ - openstack-python-jobs-neutron
+ - openstack-python35-jobs-neutron
- release-notes-jobs
- translation-jobs
- publish-openstack-sphinx-docs
