ref(builder): remove volume definition in Dockerfile

This was missed in #1917.
fix(deisctl): typos in publisher unit file
Merge pull request #1990 from bacongobbler/hotfix-publisher

fix(deisctl): typos in publisher unit file
docs(deisctl): clarify deisctl version when using install.sh
Merge pull request #1991 from carmstrong/clarify_deisctl_link

docs(deisctl): clarify deisctl version when using install.sh
Merge pull request #1984 from carmstrong/remove_builder_volume

ref(builder): remove volume definition in Dockerfile
fix(builder): restore VOLUME instruction so builder does not stack overlay filesystems

fix(builder): add comment explaining dockerfile volume change
Merge pull request #1996 from gabrtv/fix-builder-volume

fix(builder): restore VOLUME instruction so builder does not stack overlay filesystems
ref(tests): update details in CI node setup script
Merge pull request #1983 from mboersma/test-setup-tweaks

ref(tests): update details in CI node setup script
chore(builder): migrate to cedar-14 stack

With quantal coming out-of-support, heroku implemented the cedar-14
stack. This stack is what's used on heroku in production today AFAIK.
Migrating over to this stack makes us more compatible with Heroku.