remove second puppet run from learning_cleanup.sh
remove second puppet run from learning_cleanup.sh

Now that the pe module has been fixed this isn't needed.
Also removed the docker module install now that there's
an r10k method implemented.

carthik/puppetlabs-training-bootstrap,samuelson/puppetlabs-training-bootstrap,samuelson/education-builds,kjhenner/puppetlabs-training-bootstrap,joshsamuelson/puppetlabs-training-bootstrap,puppetlabs/puppetlabs-training-bootstrap,marrero984/education-builds,samuelson/puppetlabs-training-bootstrap,puppetlabs/puppetlabs-training-bootstrap,samuelson/education-builds,carthik/puppetlabs-training-bootstrap,joshsamuelson/puppetlabs-training-bootstrap,joshsamuelson/puppetlabs-training-bootstrap,carthik/puppetlabs-training-bootstrap,samuelson/puppetlabs-training-bootstrap,marrero984/education-builds,kjhenner/puppetlabs-training-bootstrap,marrero984/education-builds,kjhenner/puppetlabs-training-bootstrap,puppetlabs/puppetlabs-training-bootstrap,samuelson/education-builds