[task] moved DAOs, entities, tests, etc. to auth-server
[task] removed residues of oauth client handling in resource server
[task] moved all oauth client specific stuff to auth-server
[fix] finally removed DBVersion entity
[cleanup] removed last residues of client handling in resource server
[cleanup] removed database version stuff
[task] moved endpoint security for client management from resource
server (currently not used, see OSNG-443)
[cleanup] improved javadoc
[cleanup] organized imports
Merge pull request #189 from tkrille/OSNG-435_OSNG-438

Osng 435 osng 438