Create consistent soft link for removable media

:Release Notes:
Create consistent soft link to an inserted removable media
Remove assotiated link if media removed

:Detailed Notes:

:Testing Performed:

:QA Notes:

:Issues Address:
[GF-9348] DB8 Ext: Create consistent soft link to an inserted removable media

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

Change-Id: I2d300431481558b56ff6ee3fd0e9de42d7383c41
Reviewed-on: https://g2g.palm.com/3203
Reviewed-by: Build Verification
Reviewed-by: Maksym Sditanov <maxim.sditanov@lge.com>
Tested-by: Maksym Sditanov <maxim.sditanov@lge.com>
Reviewed-by: Roger Stringer <roger.stringer@lge.com>