Create a group for the RAVEN pipeline, add users, and give the group
specific permissions. Right now, they are just allowed to populate
the Fermi, SNEWS, and Swift pipelines for uploading external events.

Too many users are complaining about not receiving phone or email
alerts. I need to know when the relevant contacts and notifications
were created, updated, verified, etc. so I can confirm or deny that
they had configured things correctly.

Certain filters are being moved out of the djangorestframework
package and into djangorestframework-guardian.

The previous method is removed in Django 2.0 and is causing
all kinds of warnings in testing with pytest.

with --ignore calls

Co-authored-by: Tanner Prestegard <tanner.prestegard@ligo.org>

mainly to mock out getting the internal phone number list

Email alerts seem to be more problematic due to AWS SES rate
limiting and phone alerts are more important, so we should send
phone alerts first.

Addition to 058fd28d.