[BUILD] add sonar to whiteboard

Change-Id: Id8765ee398c0b92dc3a16e450ed29d406da9a917
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1714
Reviewed-by: Arsenij Solovjev <xeper000@gmail.com>
Tested-by: Arsenij Solovjev <xeper000@gmail.com>