OPS-1593 As an operator, I want sudo_user converted to become user in roles and plays, for compatibility with Ansible 2.x

The headers were pointing to the old github wiki. Since we've officially
moved to Confluence, these links should be updated.

refactoring common inclusion based on comments

removing motd template from common

Removing sshd template

relocating temlates

relocating templates

Relocating dhclient templates

explicit play depends

Update responsibilities

indent

further dependency updates

additional updates

Common dependency for server utils

Supervisor is required for role integrity

Typos

further template ownership changes

These are a few plugins that I don't think we use on admin anymore and should be removed from this list.

Because admin_jenkins runs various management commands locally, it needs to be able to run the edxapp locally.  This means that it needs to be able to install the system requirements needed by the edxapp so that pip install to local venvs work correctly.

Part of the file name template is eaten up by Python's `%` formatting,
resulting in log files missing the `s` of "stderr" and "stdout".

Periodically refresh what the primary nat is from AWS it changes
out from under the script.

Since this file changes rapidly in jenkins and it is difficult to manage
via version control here.  It's hard to maintain the changes made from
Jenkins in sync here, so remove it from git to reduce complexity.