fix(task): consume table iterators when executing query
fix(task): consume table iterators when executing query

Leaving tables unconsumed seems to cause a variety of problems,
including deadlocks and queries that don't actually execute.

nooproblem/influxdb,nooproblem/influxdb,mark-rushakoff/influxdb,nooproblem/influxdb,mark-rushakoff/influxdb,influxdb/influxdb,influxdata/influxdb,mark-rushakoff/influxdb,mark-rushakoff/influxdb,influxdb/influxdb,influxdb/influxdb,mark-rushakoff/influxdb,influxdb/influxdb,nooproblem/influxdb,mark-rushakoff/influxdb,influxdb/influxdb,li-ang/influxdb,li-ang/influxdb,influxdb/influxdb,influxdata/influxdb,nooproblem/influxdb