Oslo has been updated to the latest version

Change-Id: I530e52d682cce0f0caa28781ed660920ba54064f
Add request/response logging when debug=True

* print headers/environ of request and response
* print bodies of request and response

Here is an example of output: https://gist.github.com/Frostman/5879730

Change-Id: I4a5777962d5cb397f1478ac0f04fb380fbdc1285
Unnecessary logging removed from nova and cinder clients

Change-Id: Icc1adca9a7b66529d2f7d5f1b53c272f7f0b9ce2