Implement BGP extension

Fix proposed to branch: master
Review: https://review.openstack.org/308446

Reviewed: https://review.openstack.org/308446
Committed: https://git.openstack.org/cgit/openstack/networking-midonet/commit/?id=ea7d105ced27da4653d0b2047d2d3e8b62d3b8e4
Submitter: Jenkins
Branch: master

commit ea7d105ced27da4653d0b2047d2d3e8b62d3b8e4
Author: HoboK <email address hidden>
Date: Wed Apr 20 16:14:14 2016 +0000

    BGP extension implementation(1st stage)

    This patch includes following modifications.
    * support bgp-speaker, bgp-peer and binding speaker and peer.
    * add router_id parameter to bgp-speaker.
      (this parameter must be specified in 1st stage.)
    * attached network and destination network in extra routes are
      showed as advertised routes.
    * unit tests for bgp extension.
    * create bgp-speaker without router is not implemented.
      (this limit will be lifted in 2nd patch.)

    MidoNet plugin is different from upstream as follows.
    * binding bgp-speaker to network is not supported in MidoNet.
    * bgp-peer can relate to only one bgp-speaker in MidoNet.
    * these parameters are ignored in MidoNet.
      - advertise_floating_ip_host_routes
      - advertise_tenant_networks

    Change-Id: I8fb421459876346e3630c0f6661795e6517c7ce0
    Closes-Bug: #1554962

Reviewed: https://review.openstack.org/317028
Committed: https://git.openstack.org/cgit/openstack/networking-midonet/commit/?id=0211082815856960be4f4366d3628b3d72ad95bd
Submitter: Jenkins
Branch: master

commit 0211082815856960be4f4366d3628b3d72ad95bd
Author: Ryu Ishimoto <email address hidden>
Date: Mon May 16 17:46:26 2016 +0000

    Spec for bgp-speaker-router-insertion

    Partial-bug #1554962

    Change-Id: I795a12c1ff77a9194e3ecf12af29b8c7a037d06c