create snapshot throws 500 Internal Error

[huangtianhua]

The server doesn't check whether the parameter "volume_id"is in request body. So the 500 error has been thrown.

We should catch the KeyError and transfer the KeyError to 400(HTTPBadRequest) instead of 500.

Both v1 and v2 have the same problem.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/56886

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/56886
Committed: http://github.com/openstack/cinder/commit/381e717b4cdebb75f90dc4c62120e8d607f2a98c
Submitter: Jenkins
Branch: master

commit 381e717b4cdebb75f90dc4c62120e8d607f2a98c
Author: huangtianhua <email address hidden>
Date: Mon Nov 18 16:58:45 2013 +0800

    Create snapshot throws 500 Internal Error

    The server doesn't check whether the parameter "volume_id" is in request body.
    So the 500 error has been thrown.

    We should catch the KeyError and transfer the KeyError to 400(HTTPBadRequest)
    instead of 500.

    Change-Id: I8a1dde1fd6ed820b39995af434efacc2a27c9604
    Closes-Bug: #1252179