Remove server components from webclient to dbapi module
Set @Required for databaseService properties. Add nodeInfo fetcher
Merge changes from master
Fix Integer to Long in SessionInfoProvider
Remove entities from core to dbapi module
Fix code. Add docu for interfaces
+ move getMetricNames into CustomMetricNamesProvider
+ split StandardMetricNameProvider into 2 providers : for validators and for latency metrics
+ code clean
Merge pull request #477 from amikryukov/DbApiFull-correction

JFG-694 Remove entities and parameters from core to dbapi module