Tech - Doctors: Delete zombie dbs [#52117673]

Pivotal tracker story [#52117673](http://www.pivotaltracker.com/story/show/52117673) in project *Tech - Doctors*:

> While deleting build directory, delete also databases which should be related to given build 
> 
> Databases are identified by:
> dirSha_commitSha Mysql
> dirSha_commitSha Mongo