Update to 8.0.0~b3

Update to 8.0.0~b3

* DEB:
  - Source [0]
  - Add missing dependencies (radvd, python-openvswitch, python-pyroute2)
    Commits 918a100 a5a14ee
  - Update references to Nicira NVP plugin (e839df9)
  - Add doc package and git as a build dependency

* RPM:
  - Source [1]
  - Add doc package

* Updated dependencies according to global requirements [2]
* Updated tests

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

Change-Id: I2c248190d78401eb882562cac47099ad3a16529e