Prevent generation of `.$domain.pem` certificate.
Prevent generation of `.$domain.pem` certificate.

Closes #14.

koubas/docker-puppetmaster,talwai/docker-puppetmaster,deinarson/docker-puppetmaster,deinarson/docker-puppetmaster,guimaluf/docker-puppetmaster,bitswarm-ops/docker-puppetmaster,talwai/docker-puppetmaster,lngarrett/docker-puppetmaster,lngarrett/docker-puppetmaster,bitswarm-ops/docker-puppetmaster,koubas/docker-puppetmaster,NickelMedia/docker-puppetmaster,lngarrett/docker-puppetmaster,koubas/docker-puppetmaster,rfkrocktk/docker-puppetserver,rfkrocktk/docker-puppetmaster,guimaluf/docker-puppetmaster,deinarson/docker-puppetmaster,talwai/docker-puppetmaster,rfkrocktk/docker-puppetmaster,bitswarm-ops/docker-puppetmaster,NickelMedia/docker-puppetmaster,rfkrocktk/docker-puppetmaster