Updated openstack/openstack
Project: openstack/cinder  fe5fdd378a5e2a2fdd8678ce86b90c0dbfe9058d
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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