* Introduce Kapacitor and InfluxDB as command line options
If omitted, their values will be null at runtime. If supplied, e.g.:
chronograf
--kapacitor https://path.to.my:1/kapacitor/instance
--influxdb https://path.to.my:1/influxdb/instance
Their values will be accessible via
Server.Kapacitor
Server.InfluxDB
* MultiSourcesStore will hold Bolt and config’d sources
* Delegate to db.SourcesStore for now
* Add Username/Password tags for InfluxDB and Kapacitor
* Builders for MultiSourceStore and MultiLayoutStore
* Store Kapacitor and InfluxDB configs in memory
* Typo
* Update CHANGELOG
* Move StoreBuilders to server/builders.go
* Correct these assertions by reversing them
* Kapacitor -> KapacitorURL; InfluxDB -> InfluxDBURL