Fixed environment variables injected
Fixed environment variables injected

When linking to a container aliased INFLUXDB (as stated in the docs), the injected env variable will be `INFLUXDB_PORT_8086_TCP_PORT` instead of `INFLUXDB_1_PORT_8086_TCP_PORT`
webdizz/grafana,tutumcloud/tutum-docker-grafana,tutumcloud/tutum-docker-grafana,lalyos/docker-rpi-grafana,lalyos/docker-rpi-grafana,tutumcloud/grafana,webdizz/grafana,savoirfairelinux/docker-grafana,tutumcloud/grafana,supertylerc/grafana,savoirfairelinux/docker-grafana,supertylerc/grafana