lbaas add vip should allow vip from a different subnet

[Rabi Mishra]

Current implementation of adding a 'vip' from the horizon dashboard by default uses the pool 'subnet' and does not allow to select the vip from a different subnet. It has an optional parameter to select an available ip from the pool subnet or it picks the next available ip from the pool subnet

Neutron does not have any restriction on where 'vip' ip should be from. It can be from any 'subnet' available.

Dasboard should optionally allow user to select a subnet from the available subnets.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/76763

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/76771

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/76771
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=75e39db48c173655838cb0c77a58f9a948cef33a
Submitter: Jenkins
Branch: master

commit 75e39db48c173655838cb0c77a58f9a948cef33a
Author: Rabi Mishra <email address hidden>
Date: Thu Feb 27 11:30:45 2014 +0530

    Adds option to select a different subnet when adding 'vip'

    With this fix, 'AddVip' from the dashboard gives user an
    option to select a different subnet than the 'pool' subnet
    and then creates a 'vip' with an ip (provided/next available)
    from the selected subnet.

    Change-Id: I25f36090c5fb739256b62a88915f6414e39a915f
    Closes-Bug: #1285504