Add initial support of com.webos.mediadb 'service'

:Release Notes:
com.webos.mediadb is a third database zone supported by DB8, and its
data and indexes are located on the "/media/cryptofs" partition at the
folder "data/.db8".
The two existing zones are addressed as com.palm.db and com.palm.tempdb

:Detailed Notes:
- Add support files for launching, service  and for LS2 permissions
- Writes its data and indexes to a persistent area"/media/cryptofs/data/.db8"
- New element m_mediaService created in MojDbLunaServiceApp class

:Testing Performed:
- Ran through DB8 unit test suite with no unexpected failures
- Created Kinds with indexes for com.webos.mediadb
- Added records to the Kinds
- Searched on the records

:QA Notes:
Not yet tested on Desktop

:Issues Addressed:
[GF-31426] Update/add service files supporting com.webos.mediadb
[GF-31427] Update/add mediadb support in DB8

Open-webOS-DCO-1.0-Signed-off-by: Roger Stringer <roger.stringer@lge.com>

Change-Id: I6dd8c787df003cd465404091b5992bed9f8d8944
Reviewed-on: https://g2g.palm.com/3186
Reviewed-by: Build Verification
Tested-by: Roger Stringer <roger.stringer@lge.com>
Reviewed-by: Yasaswini AY <yasaswini.ay@lge.com>
Tested-by: Yasaswini AY <yasaswini.ay@lge.com>
Reviewed-by: Kyouhyun Hwang <kyouhyun.hwang@lge.com>
Reviewed-by: Roger Stringer <roger.stringer@lge.com>