error message of os-cells sync_instances api is incorrect

[Yuiko Takada]

Though parameters of this api are 'updated_since' , 'project_id' and 'deleted',
the error message is "Only 'updated_since' and 'project_id' are understood."
It shoud be "Only 'updated_since', 'project_id' and 'deleted' are understood."

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/50866

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/50866
Committed: http://github.com/openstack/nova/commit/27466f2a8f518cfda2935ddd882a99f6736296af
Submitter: Jenkins
Branch: master

commit 27466f2a8f518cfda2935ddd882a99f6736296af
Author: Yuiko Takada <email address hidden>
Date: Thu Oct 10 08:35:28 2013 +0000

    Fix error message of os-cells sync_instances api

    Because parameters of this api are 'updated_since' , 'project_id'
    and 'deleted',add 'deleted' to the message "Only 'updated_since'
    and 'project_id' are understood."

    Change-Id: Ic2b2314861030b029be5df490e123d8976711193
    Closes-Bug: #1237836