Readd support to report to InfluxDB
Readd support to report to InfluxDB

Somewhere in the process of going from capwap-1.7.0 to 2.0.0 the
exometer-influxdb reporter was lost. Since InfluxDB is still in use in
some production sites, not having the InfluxDB client in place makes
upgrading to capwap-2.x a show stopper.

This commit (re)adds support for InfluxDB.

travelping/capwap,travelping/capwap