Update to 8.0.0.0b1

- Source [0]
- Add missing dependencies (radvd, python-openvswitch, python-pyroute2)
  Commits 918a100 a5a14ee
- Update references to Nicira NVP plugin (e839df9)
- Do not manage nova_admin_* options from templates (054c7f1)
- Generate configuration files
- Add missing packages neutron-plugin-sriov-agent and neutron-plugin-ml2
- Add doc package and git as a build dependency
- Update requirements according to global requirements [1]
- Update tests

[0] http://anonscm.debian.org/git/openstack/neutron.git/tree/?h=debian/mitaka
[1] https://github.com/openstack/requirements/blob/master/global-requirements.txt

Change-Id: Ic698dfe2e877c6e3ff8dc8f1811631482f449237