Pin to specific version of prometheus
Pin to specific version of prometheus

I believe this image was last built prom/prometheus:0.15.1 was also
tagged as :latest.  Let's be explicit and rebuild to get the new
release.

maratoid/kraken-services,Samsung-AG/kraken-services,mikeln/kraken-services,mikeln/kraken-services,mikeln/kraken-services,mikeln/kraken-services,maratoid/kraken-services,maratoid/kraken-services,Samsung-AG/kraken-services,Samsung-AG/kraken-services,mikeln/kraken-services,maratoid/kraken-services,Samsung-AG/kraken-services,Samsung-AG/kraken-services,Samsung-AG/kraken-services,mikeln/kraken-services,maratoid/kraken-services,maratoid/kraken-services