Updated openstack/openstack
Project: openstack/cinder  0123feb08293406bfe67a35e79e8251bd8cf96a1
null
Support volume_readonly_update using XML format

Almost all API support JSON and XML format together,
But this API does not support xml format.
In the request of xml format,
the type of parameter "readonly" in the body is string.
In the request of JSON format,
the type of parameter "readonly" in the body is bool.
But the code only support bool, not support string.
This branch is to solve this problem.

Closes-bug #1244848

Change-Id: I7f2b09a0063df9daad3fdd09789f8e19c43b0aa3
(cherry picked from commit 76497ce9607df98e9e10fb1de1b6e607432f731b)