added kws mongodb dumps
added clean scripts
rename update files to match db_collection pattern

update_das_db.js is actually updating mapping DB, so renamed it.
this is less confusing and allow easier abstraction.
renamed files to follow consistent convensions

the conventions are:
* clean_objectname (objectname here is name of configuration file which list all the related updates)
* update_db_collection

related to issue dmwm/DAS#4041
Merge pull request #1 from dmwm/kws

changes for KWS and minor cleanup