Do not assume OS release
The ceilometer charm was assuming grizzly before the ceilometer-common package was installed to determine the OS release. On queens deploys this breaks due packages not being installed. If ceilomter-common is not installed return empty configs. Change-Id: Ib8bc1b7be3595bd8e64a25d0444dd768b80de881 Closes-Bug: #1759301
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