* Relaxes the configuration options for influxdb
By default influxdb allows unauthenticated access
Home Assistant required at least username and password to be present to properly submit data to influxdb
* Removes unused import of 'copy'
The copy module was used only in the removed test case responsible for testing the missing keys
* Updates InfluxDB config schema to require user and password
Current InfluxDB (v 1.0) can work without any authentication, but when authentication is enabled both username and password should be set.
* Removes extra white space in test_influxdb.py
