Allow sending on behalf of other services

:Release Notes:
Fix luna-send to be able to mock other services with -m.

:Detailed Notes:
LS2 security prohibited luna-send to LSRegister() with arbitrary name.

:QA Notes:

:Testing Performed:
Tested on TV with NFS
killall eim && luna-send -m com.webos.service.eim -n 1 -f \
luna://com.webos.surfacemanager.inputpopup/createInputPopup \
'{"appId":"com.webos.app.tvuserguide", \
"portType": "HDMI", \
"portName": "HDMI-1", \
"portIcon": "/usr/palm/applications/com.webos.app.hdmi1/assets/icon_HDMI_1_130.png", \
"timeout": 10}'
>>
{
    "subscribed": false,
    "errorCode": 0,
    "inputPopupId": "com.webos.app.tvuserguide-1:51:31.302",
    "returnValue": true
}

:Issues Addressed:
[BHV-2211] luna-service2: add luna-send exception for service name registration

Open-webOS-DCO-1.0-Signed-off-by: Olexandr Solomakha <oleksander.solomakha@lge.com>

Change-Id: I9128700e28689938bbaafd8d44664def73bc1259
Reviewed-on: https://g2g.palm.com/5013
Reviewed-by: DCO Verification
Reviewed-by: Anatolii Sakhnik <anatolii.sakhnik@lge.com>
Tested-by: Anatolii Sakhnik <anatolii.sakhnik@lge.com>
Reviewed-by: Olexandr Solomakha <oleksander.solomakha@lge.com>
Tested-by: Olexandr Solomakha <oleksander.solomakha@lge.com>