Remove from spamtest rights for su

:Release Notes:
Fix spam test

:Detailed Notes:
Make spamtest runable without additional right for su

:Testing Performed:
Compiled and tested localy.

:QA Notes:

:Issues Addressed:
[BHV-1214] SpamTest - fix mount rule

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

Change-Id: Iff218fe64062ead31ee2c1756409884d78f7c64f
Reviewed-on: https://g2g.palm.com/4859
Reviewed-by: DCO Verification
Reviewed-by: Maksym Sditanov <maxim.sditanov@lge.com>
Tested-by: Maksym Sditanov <maxim.sditanov@lge.com>