Arvados

• On the sls files, there’re commented letsencrypt.conf snippets entries, I think we could get rid of them if they aren’t used (following our own code style standards of not keeping commented out code).
• Got some error when trying to start it with vagrant (as a new instance)

...
    arvados:     Rendering SLS 'base:docker.software.package.repo.install' failed: Jinja variable 'null' is undefined
    arvados: Removing .psql file
    arvados: + '[' xyes = xyes ']'
    arvados: + echo 'Removing .psql file'
    arvados: + rm /root/.psqlrc
    arvados: Copying the Arvados CA certificate to the installer dir, so you can import it
    arvados: + '[' x = xyes ']'
    arvados: + echo 'Copying the Arvados CA certificate to the installer dir, so you can import it'
    arvados: + '[' xyes = xyes ']'
    arvados: + cp /etc/ssl/certs/arvados-snakeoil-ca.pem /vagrant
    arvados: cp:
    arvados: cannot stat '/etc/ssl/certs/arvados-snakeoil-ca.pem'
    arvados: : No such file or directory
    arvados: Adding the vagrant user to the docker group
    arvados: + echo 'Adding the vagrant user to the docker group'
    arvados: + usermod -a -G docker vagrant
    arvados: usermod: group 'docker' does not exist
    arvados: + '[' xyes = xyes ']'
    arvados: + cd /tmp/cluster_tests
    arvados: + ./run-test.sh
    arvados: The Arvados CA was not correctly installed. Although some components will work,
    arvados: others won't. Please verify that the CA cert file was installed correctly and
    arvados: retry running these tests.
The SSH command responded with a non-zero exit status. Vagrant
assumes that this means the command failed. The output for this command
should be in the log above. Please read the output to determine what
went wrong.

Added a few more commits, commit ebd40412f@arvados, branch 17177-use-newly-created-ca

Tested locally and both the WB2-UI and CLI work.

a434550 LGTM, thanks!