since amount of objects is growing and looping through all of them
starts taking lot of time, we are switching for SQL query to do it
in chunks of tallies per bucket. 2nd part of issue fix.
Closes https://github.com/storj/team-metainfo/issues/125
Change-Id: Ia26bcac0a7e2c6503df9ebbf4817a636841d3284
The main motivation is to wrap the bucket DB and metainfo DB, so we
could check if a bucket is empty before applying geofencing config.
Change-Id: I8bac21555e01d51a663fb557bc1acfc8106bc2e1