bcfg2-report-collector init script is missing in debian package

Hi,

currently the init script for the bcfg2-report-collector is not available in the bcfg2-server debian package. The name of the init script suggest, that there should be another package called bcfg2-report-collector but I did not know if it would make sense. The report-collector uses parts of the bcfg2-server python modules so a standalone installation would be possible at this point.

So this pull request change the debian/ directory to include the bcfg2-report-collector init scirpt in the bcfg2-server debian package, install it, but does not automatically enable it (like the other init scripts).

Thanks,
Alex