[#55484066] sneha/dancarley Nginx security for mirror

Disabled the server tokens, so that we do not expose the nginx version
to end user.
Returning 444 - no content if someone hits url other than mirror url
[#55483444] dancarley/sneha making puppet bootstrap quieter.
Change sudo module from our fork to original repo

He has merged my PR but not released it to the Forge. I've asked him if he can,
and in the meantime switched back to at least using his version on Github.
Merge pull request #4 from alphagov/55484066_nginx_security_for_mirror

[#55484066] sneha/dancarley Nginx security for mirror
Merge pull request #5 from alphagov/55483444_making_deployment_quieter

[#55483444] dancarley/sneha making puppet bootstrap quieter.
Merge pull request #7 from alphagov/55482568-use-sudo-module

Change sudo module from our fork to original repo
Merge branch 'master' of github.com:alphagov/govuk_mirror-puppet into better-ssl

Conflicts:
  hieradata/common.yaml