Rename test service to mojodbmedia-test

:Release Notes:
Rename test service to mojodbmedia-test

:Detailed Notes:

:Testing Performed:
tested on build

:QA Notes:
Run: /usr/lib/db8/tests/gtest_db_media

:Issues Addressed:
[GF-42590] gtest_db_media: permission issue

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

Change-Id: I07a9b0caa3415787edbec11c3a6ce09acabf2dbc
Reviewed-on: https://g2g.palm.com/3786
Reviewed-by: Build Verification
Reviewed-by: Maksym Sditanov <maxim.sditanov@lge.com>
Tested-by: Maksym Sditanov <maxim.sditanov@lge.com>
Reviewed-by: Igor Kuksyuk <ikuksyuk@luxoft.com>
Tested-by: Igor Kuksyuk <ikuksyuk@luxoft.com>