Fix MockBase DeleteRequest where if only a key and table were supplied, the row was not deleted properly.
Fix MockBase DeleteRequest where if only a key and table were supplied, the row
was not deleted properly.

Signed-off-by: Chris Larsen <83037b211e1d109d6858769a113e269c3139ffd3@euphoriaaudio.com>

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