pkg/services/sqlstore/user_auth_test.go: comment unused users slice
pkg/services/sqlstore/user_auth_test.go: comment unused users slice

See,
$ gometalinter --vendor --deadline 10m --disable-all --enable=megacheck ./...
pkg/services/sqlstore/user_auth_test.go:28:18:warning: this result of append is never used, except maybe in other appends (SA4010) (megacheck)

grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana,grafana/grafana