Recursive glob in gunicorn config can hang augur on large installs

[GregSutcliffe]

Description:
Having Facade data mounted inside the Augur tree (which is true in Docker) will cause Augur to hang on a large install

How to reproduce:

1. Have a large install (I have 2Tb of clones)
2. Mount it inside Augur (I'm using Docker and it's at /augur/facade)
3. Start Augur - Gunicorn will hang for a long time (I gave up after several hours)

The culprit is here:

https://github.com/chaoss/augur/blob/a31a04cc9e22dbd157a01b3a3a498cd01cc44788/augur/api/gunicorn_conf.py#L22C1-L22C71

reload_extra_files = glob(str(Path.cwd() / '**/*.j2'), recursive=True)

That is a recursive glob, starting at Path.cwd(), looking for .j2 files. If that code hits a large number of files (such as Facade) then it will take an immense amount of time to process. Worse, it may actually find j2 files from outside Augur and load them, which is potentially a security risk.

As far as I can tell, the only j2 files are in augur/templates, so we should drop the recursive glob and just look there.

[GregSutcliffe]

Alternatively, perhaps we could just delete it? A quick grep suggests reload_extra_files isn't used anywhere in the codebase