[INTERNAL] add sonar-project.properties

These are needed for sonar to know meta-data as well as potential
properties, when running a sonar analysis.
But for now we will define the properties in the Jenkins Job
which runs Sonar.

Change-Id: I5d0e8c064ba583133840ddd4c446ed4adc9a3d54
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/1545
Tested-by: Jenkins CI
Reviewed-by: Arsenij Solovjev <xeper000@gmail.com>