Comment 3 for bug 1563565

It's missing the utf-8 fix:
- device = usage["device"]
+ device = usage["device"].encode("utf-8")

Unhandled error in Deferred:
Unhandled Error
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/twisted/internet/base.py", line 1201, in mainLoop
    self.runUntilCurrent()
  File "/usr/lib/python2.7/dist-packages/twisted/internet/base.py", line 797, in runUntilCurrent
    f(*a, **kw)
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 382, in callback
    self._startRunCallbacks(result)
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 490, in _startRunCallbacks
    self._runCallbacks()
--- <exception caught here> ---
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 577, in _runCallbacks
    current.result = callback(current.result, *args, **kw)
  File "/usr/lib/python2.7/dist-packages/landscape/monitor/swiftusage.py", line 144, in _handle_usage
    timestamp, usage[key], persist_key)
  File "/usr/lib/python2.7/dist-packages/landscape/accumulate.py", line 81, in __call__
    previous_timestamp, accumulated_value = self._persist.get(key, (0, 0))
  File "/usr/lib/python2.7/dist-packages/landscape/lib/persist.py", line 385, in get
    return self.parent.get(self.root + path, default, soft, hard, weak)
exceptions.TypeError: can only concatenate tuple (not "unicode") to tuple