Add configuration file for maindb,mediadb,tempdb

:Release Notes:
Add separated files to configure maindb, mediadb and tempdb

:Detailed Notes:
Move configuration files to files/conf
Create conf files maindb.conf tempdb.conf and mediadb.conf
Add install rule to cmake

:Testing Performed:
Compiled and tested localy.

:QA Notes:

:Issues Addressed:
[ANG-297] Add to mojodb.conf file path to database and service name

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

Change-Id: I1ea1130ccbe25f137ffee0d36714a579df97a8ac
Reviewed-on: https://g2g.palm.com/4432
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>