Open only one database per process

:Release Notes:
Service db8 serve only one database per process

:Detailed Notes:
Remove opening of tempdb and mediadb from MojServiceApp
Move to configuration file database path. db -> path
Move to configuration file service name: db -> service_name

:Testing Performed:
Compiled and tested localy.

:QA Notes:

:Issues Addressed:
[ANG-296] Switch main process to open only one database

Open-webOS-DCO-1.0-Signed-off-by: Maksym Sditanov <maxim.sditanov@lge.com>

Change-Id: I6dec2a31ef8f80526e0f0e4cf68a888aeee1817a
Reviewed-on: https://g2g.palm.com/4431
Reviewed-by: DCO Verification
Reviewed-by: Maksym Sditanov <maxim.sditanov@lge.com>
Tested-by: Maksym Sditanov <maxim.sditanov@lge.com>
Reviewed-by: Oleksii Uratkin <oleksii.uratkin@lge.com>