Pulp

Adds the content app to pulpcore.content

The Settings can be a lot simpler now that the architecture no longer required redirection. It does need to account for the content being served on a different HOST. This PR handles that.

Since the settings are now single values, they are much easier to override using Dynaconf, which is great.

The content app can be removed now that the streamer code is handling it all.

This PR is a prototype and has no docs. Use Pulp as normal , but run the streamer from github.com/bmbouter/pulp_streamer/ and run the streamer with:

gunicorn pulpcore.streamer:server --bind localhost:8080 --worker-class aiohttp.GunicornWebWorker -w 2

This PR needs pulp-smash changes from pulp_file so it requires the PR below:

Required PR: https://github.com/pulp/pulp_file/pull/140

https://pulp.plan.io/issues/4239 closes #4239

https://pulp.plan.io/issues/3698 closes #3698

https://pulp.plan.io/issues/3699 closes #3699

https://pulp.plan.io/issues/4181 closes #4181

https://pulp.plan.io/issues/4243 closes #4243

Add content app service

Add the systemd service file, add pulp_content_app to bash helpers and configure pulp to redirect to the content app.

https://pulp.plan.io/issues/4239 re #4239

Align default settings with new content app

https://pulp.plan.io/issues/4239 re #4239