The notifier isn't ready yet, needs theming to be done before it can be
installed.

- specify notifier_db_dir as a setting.  Had previously just stuck
  under $HOME, but Jim preferred as a distinct setting.

- pass through email settings env variables

- plumb through django's EMAIL_USE_TLS setting.  Required to be
  able to send mail using Amazon SES.  They speak smtp, but only
  over TLS.

I recently had a build where elasticsearch hadn't auto started so
I added that check here.

I added defaults of 127.0.0.1 so it shouldn't change anything unless
you overide the values with something 0.0.0.0. This allows for a
split tier type rollout of the app with central Web servers on
a different machine.

removing git accounts for notifier repo, open now

add datadog api key Since this file will be the model for others
to use for their vars files, put in a placeholder DD api key, since
it's required to be *something* currently.

celerybeat wants to write its pidfile to ~notifier/src.  Not sure why
the PID or CELERYD_PID_FILE environment variables don't correctly point
it to /var/run/... but in the meantime, this should get us by.

notifier: remove git_ssh wrapper not needed now that repo is public

run notifier on first util machine only

remove references to forums_digest.sh. File was a vestige of prior
code when this was run from cron instead of celery beat.

Without the `apt-get update`, the apt cache is out of date while attempting to install
rabbitmq. An older version from the Ubuntu repo is installed instead of the one from
the rabbit repository, which makes the role fail later on with:

```
TASK: [rabbitmq | install plugins] ********************************************
[...]
failed: [10.145.2.22] => {"failed": true, "item": ""}
msg: Failed to find required executable rabbitmq-plugins
```

Set carnegie local relative to carnegie secure, so we have to get the
prefixes right once only.

rake gather_assets replaces collectstatic
so all references and logic to handle both
are removed

removes collect_static.yml since now there are
only two tasks for rake gather_assets.

These are some minimal changes to support 1.3, does not yet include role
dependencies.