Add a tool program which generate db image

:Release Notes:
This tool can generate db image could be used for db8 initial data.

:Detailed Notes:
Find input files recusively within path indicated as first argument.
Make db image into path indicated as second argument.

:Testing Performed:
1.Input path have to include three sub dir(kind, permission and data)
2.copy the input directory to certain location of device
3.Boot device in NFS mode
4.Execute this tool (args: input file's path and output dir path)
5.Check the output path
6.Turn off device
7.Copy image files into path of DB8's main directory on device
8.Reset device
9.Query with luna-send

:QA Notes:
N/A

:Issues Addressed:
[GF-33567] DB image genarator for DB8

Open-webOS-DCO-1.0-Signed-off-by: jinyoung choi <jinyoung76.choi@lge.com>

Change-Id: If8f2d7368d510a07c501fe3949fb1f1a514642d1
Reviewed-on: https://g2g.palm.com/3222
Reviewed-by: Build Verification
Reviewed-by: Nikolay Orliuk <nikolay.orliuk@lge.com>
Reviewed-by: Maksym Sditanov <maxim.sditanov@lge.com>
Reviewed-by: Hyungjoon Lee <hyungjoon.lee@lge.com>
Reviewed-by: Jinyoung Choi <jinyoung76.choi@lge.com>
Tested-by: Jinyoung Choi <jinyoung76.choi@lge.com>
Reviewed-by: Roger Stringer <roger.stringer@lge.com>