Provide CLI access to InfluxQL Coordinator configuration

[stuartcarnie]

What

Users expect access to certain InfluxQL configuration options to tune their influxd server. The following options can be trivially exposed:

--influxql-max-select-buckets int                               The maximum number of group by time bucket a SELECT can create. A value of zero will max the maximum number of buckets unlimited.
--influxql-max-select-point int                                 The maximum number of points a SELECT can process. A value of 0 will make the maximum point count unlimited. This will only be checked every second so queries will not be aborted immediately when hitting the limit.
--influxql-max-select-series int                                The maximum number of series a SELECT can run. A value of 0 will make the maximum series count unlimited.