The LBaaS API gave the internal error when creating VIP for the pool with existing Vip

[Jason]

Creating two VIPs with the same pool_id results in a QuantumError With the following error: QuantumError": "Request Failed: internal server error while processing your request."
it should give the 4xx message or more clearly such as the same VIP had already existed.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/25008

[dan wendlandt (danwent)]

not a blocker for release, but likely something worth backporting.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/25008
Committed: http://github.com/openstack/quantum/commit/4a96b16dcb837c8085b0fb895ee6052cdde054ca
Submitter: Jenkins
Branch: master

commit 4a96b16dcb837c8085b0fb895ee6052cdde054ca
Author: Eugene Nikanorov <email address hidden>
Date: Thu Mar 21 17:19:30 2013 +0400

    Raise VipExists exception in case Vip is created or updated
    for a pool that already has a Vip

    fixes bug 1158049

    Change-Id: I258a31f5d54c040ed478ab241b0e90f2bd0f69b3

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: milestone-proposed
Review: https://review.openstack.org/25895

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/grizzly
Review: https://review.openstack.org/26193

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/26193
Committed: http://github.com/openstack/quantum/commit/f853aff4f72119d6319e63ad53e00f3d875d574a
Submitter: Jenkins
Branch: stable/grizzly

commit f853aff4f72119d6319e63ad53e00f3d875d574a
Author: Eugene Nikanorov <email address hidden>
Date: Thu Mar 21 17:19:30 2013 +0400

    Raise VipExists exception in case Vip is created or updated
    for a pool that already has a Vip

    fixes bug 1158049

    Change-Id: I258a31f5d54c040ed478ab241b0e90f2bd0f69b3