Fetch standard metrics from dbApi
Refactor entityUtil
Refactor entityUtil
Add docu for entityService
Merge branch 'master' of https://github.com/griddynamics/jagger into DbApi
revert master code
remove old code
Check empty collections
Fix empty collection problem
Merge pull request #365 from kgribov/DbApi

JFG-555 Implement API to get data from jagger results DB