Remove umediaserver hacks

:Release Notes:
Remove umediaserver hacks in luna-service2.

:Detailed Notes:
All umediaserver related hacks can be removed from the LS2
due to new glob-stype patterns in LS2 roles files and new
umediaserver interface which allows clients to set own unique ids.

:Testing Performed:
All umediaserver related components was tested without hacks.

:QA Notes:

:Issues Addressed:
[GF-42575] LS2: Remove umediaserver hacks from the hub.c

Open-webOS-DCO-1.0-Signed-off-by: Alexandr Smoktal <alexandr.smoktal@lge.com>

Change-Id: I3ca64c5b8724f8492c2247689f64833dce205919
Reviewed-on: https://g2g.palm.com/3706
Reviewed-by: Alexandr Smoktal <alexandr.smoktal@lge.com>
Tested-by: Alexandr Smoktal <alexandr.smoktal@lge.com>
Reviewed-by: Build Verification
Reviewed-by: Alekseyev Oleksandr <alekseyev.oleksandr@lge.com>
Reviewed-by: Anatolii Sakhnik <anatolii.sakhnik@lge.com>