Improve poll performance and fix permissions #46
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Metrics generated two queries for each poll. Moving device metrics code to the model as there it is known if count changed or not. Now three queries are used for each poll (assuming device in "rollout" mode) 1. Load device (usually not cached when poll starts) 2. Update last_seen etc. on device 3. Retrieve target firmware (if any)
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Closes #44 : no longer updating device metrics twice per poll.
Also fixes permission parsing.