wrong expected code for os-resetState action

[Eli Qiao]

os-resetState action have no 400(BadRequest Error) comes out, we need to remove it.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/203930

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/203930
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=df5a276643dd1c19db7b8e865bcff63cda35d363
Submitter: Jenkins
Branch: master

commit df5a276643dd1c19db7b8e865bcff63cda35d363
Author: Eli Qiao <email address hidden>
Date: Tue Jul 21 13:55:26 2015 +0800

    Correct expected error code for os-resetState action

    extensions.expected_errors will handle all error codes when a REST api method
    is decorated by it. If the REST api method has any error code which are not in
    the list of extensions.expected_errors, nova-api will return an 500 to client.

    So the list will indicate all possible return codes of this method.
    os-resetState action have no 400(BadRequest Error) comes out, remove it.

    Closes-Bug: #1476490
    Change-Id: Ia1c3da57c4e129dcbf22ca3d69e2a482222a26b9