Code review comment for ~smoser/cloud-init:feature/login-warn

There is a series of commits here that together create add support for
a.) cloud-init showing warnings to a user who ssh's in
    This is accomplished by adding a profile.d script that shows content
    in /var/lib/cloud/instance/warnings/ if it exists.

b.) warns the user when they have used a datasource that ds-identify in
    report mode did not identify.