Update grafana/grafana Docker tag to v7.2.2
Update grafana/grafana Docker tag to v7.2.2

mwutzke/faucet,mwutzke/faucet,faucetsdn/faucet,REANNZ/faucet,anarkiwi/faucet,REANNZ/faucet,shivarammysore/faucet,faucetsdn/faucet,shivarammysore/faucet,anarkiwi/faucet