The param 'readonly' for os-update_readonly_flag incorrectly checked

[zhangyanzi]

In the function os-update_readonly_flag, the param 'readonly' should be needed as a positional argument.
But it does not check the KeyError.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/58261

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/58261
Committed: http://github.com/openstack/cinder/commit/f1cc8726058a5b3bc4b955e3441e498c2ead8471
Submitter: Jenkins
Branch: master

commit f1cc8726058a5b3bc4b955e3441e498c2ead8471
Author: zhangyanzi <email address hidden>
Date: Mon Nov 25 19:33:49 2013 +0800

    The param 'readonly' is incorrect checked

    In the function os-update_readonly_flag, the param 'readonly' is incorrect
    checked, without the param in request, i think it should raise exception
    with message like "Must specify readonly in request."

    Change-Id: I19e15e988ffa2d093d374f6a33ce94d45ffe2c30
    Closes-bug: 1254682