Fix logging in wsgi module
Fix logging in wsgi module

- Method names in the wsgi module are
  being logged incorrectly, like "Calling method
  <bound method METHODNAME of CLASS object at HEXADDR>".
- The body attribute needs to be decoded when logging.
- HTTP Status codes can be passed as strings.

TrivialFix
Change-Id: I423de87cf09caa522817a9b949dbf448be833587

openstack/manila,openstack/manila