Radware lbaas driver need handle pool members coming from different subnets

[Evgeny Fedoruk]

Radware LBaaS driver should be able to handle pool members when each member is on different sub-net.

This is dependent on change https://review.openstack.org/#/c/69009/

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/95375

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/95375
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=6bed4a09bd67e0ac5daf8bcb4ef7b9ee8161bac2
Submitter: Jenkins
Branch: master

commit 6bed4a09bd67e0ac5daf8bcb4ef7b9ee8161bac2
Author: Evgeny Fedoruk <email address hidden>
Date: Sun May 25 06:52:20 2014 -0700

    Adding static routes data for members

    Adding extra data on member entities for routing.
    Subnet, mask and gateway data is attached to each member.
    Default values are:
     subnet=255.255.255.255
     mask=255.255.255.255
     GW=255.255.255.255

    Only in case when LB is connected to both, pool sub-net and vip sub-net
    and member is not on pool's sub-net, routing info will be determined
    instead of setting to default values:

    1. In case when member's port is found, member's subnet and mask
       data will be set to those of the port, gateway will be set to pool's
       gateway address

    2. In case when no port found or more than one port found for member's IP address,
       member's subnet will be set to member's IP address value , gateway will be set
       to pool's gateway value, and mask will be set to default 255.255.255.255

    New unit tests were added for testing following scenarios:
    1. Adding 3 members on 3 different sub-nets, vip's, pool's and other sub-net
    2. Adding member on other than pool's sub-net with no port
    3. Adding member on other than pool's sub-net with multiple ports with same IP address
       but on different sub-nets

    Internal vip graph building function was added (_populate_vip_graph)
    for more convenient code re-use and better structure

    Change-Id: I6d592ffe8ee3f82f56a4bfbe1d420541871dad2d
    Closes-Bug: 1291417