Output any deprecation warnings one per day
Output any deprecation warnings one per day

After fixing known deprecations, there needs to be a way to find new
ones when they occur. Right now enough runs fail that the deprecations
can be seen in the failure emails. Eventually all runs will pass
regularly so the deprecations need to be sent so they are known ahead
before upgrading Ansible. Each run happens once per hour. Output all
deprecation warnings from the midnight run.

buildbot/buildbot-infra,seankelly/buildbot-infra,seankelly/buildbot-infra,buildbot/buildbot-infra,seankelly/buildbot-infra,buildbot/buildbot-infra