The ipdevpoll 5minstats job crashes in the statsystem plugin on VRF master devices

[lunkwill42]

Under NAV 4.8.1, the statsystem plugin has been observed to crash the 5minstats job. It appears the problem occurs because of unintentional overwriting a variable when duplicating statistics for VRF instances. Traceback as follows:

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 423, in errback
    self._startRunCallbacks(fail)
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 490, in _startRunCallbacks
    self._runCallbacks()
  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/twisted/internet/defer.py", line 1155, in gotResult
    _inlineCallbacks(r, g, deferred)
--- <exception caught here> ---
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 1097, in _inlineCallbacks
    result = result.throwExceptionIntoGenerator(g)
  File "/usr/lib/python2.7/dist-packages/twisted/python/failure.py", line 389, in throwExceptionIntoGenerator
    return g.throw(self.type, self.value, self.tb)
  File "/usr/lib/python2.7/dist-packages/nav/ipdevpoll/plugins/statsystem.py", line 78, in handle
    power = yield self._collect_power(netboxes)
  File "/usr/lib/python2.7/dist-packages/twisted/internet/defer.py", line 1099, in _inlineCallbacks
    result = g.send(result)
  File "/usr/lib/python2.7/dist-packages/nav/ipdevpoll/plugins/statsystem.py", line 204, in _collect_power
    for index, power in power.items():
exceptions.AttributeError: 'long' object has no attribute 'items'