Updated openstack/openstack
Project: openstack/requirements  528d515436f63df0a9e1fb6966c4a6a68c8eca03
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WSME: update to 0.6

0.6 version adds some API parameter type classes for API validation.
We can replace each project's own classes with these WSME's classes.
By sharing the same classes between projects, it conduces to good
quality.

Change-Id: I2e93f73c7caf2b176290c62562a109ded4b0e077