NSX|V router create with availability zones hints

[OpenStack Infra]

https://review.openstack.org/316654
Dear bug triager. This bug was created since a commit was marked with DOCIMPACT.
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commit b2858f8719f077282acced718b1535afbea79c5b
Author: Adit Sarfaty <email address hidden>
Date: Mon May 16 11:26:00 2016 +0300

    NSX|V router create with availability zones hints

    Add support for availability zones hints on routers creation
    - The router will be created on an edge that belongs to the requested resource pool
    - The nsxv_router_binding db table has a new column for the edge resource pool
    - New nsxv configuration: availability_zones which should contain a list
    of resource pools ids, that can be used as hints

    DocImpact: New configuration parameter availability_zones under nsxv

    Change-Id: Ib34689d554dafe25f62a045feebe9eed68d2174d