Added a playbook to deploy an alerting tool, Kapacitor that can work
with influxdb. Updated readme to demonstrate how to deploy Kapacitor.
Kapacitor can be used to trigger alerts based on some uncertain
events. It subscribes to influxdb to collect data.
General Flow:
Telegraf -> InfluxDb -> Grafana
Telegraf -> InfluxDb -> Kapacitor
Change-Id: I5c400cf9efbda43bb5cb7a9bbd890435e74127f3