Add a 'fsck' subcommand for the 'uid' command.
Add a 'fsck' subcommand for the 'uid' command.

This command checks the consistency (or lack thereof) of the UID table.

Change-Id: Ia02bce581e26f8cc3a9a0cb39cbbc690307f4981

ShefronYudy/opentsdb,kidaa/opentsdb,johann8384/opentsdb,MadDogTechnology/opentsdb,alienth/opentsdb,MadDogTechnology/opentsdb,OpenTSDB/opentsdb,eswdd/opentsdb,OpenTSDB/opentsdb,johann8384/opentsdb,sidhhu/opentsdb,sidhhu/opentsdb,kidaa/opentsdb,alienth/opentsdb,MadDogTechnology/opentsdb,eswdd/opentsdb,andyflury/opentsdb,ShefronYudy/opentsdb,OpenTSDB/opentsdb,andyflury/opentsdb