Ability to send poller stats to InfluxDB

It would be helpful to be able to send telemetry data for device polling information to InfluxDB.

At present I have hacked poller-wrapper.py to include a number of calls via os.system to InfluxDB to send individual device metrics and global poller-wrapper run stats and then built a dashboard in Grafana to provide a live overview and alerting for poll timers of my Observium nodes.