Done using isort[1], with the following command:
```
isort -rc ./app ./tests
```
Adds linting to the `run_tests.sh` script to stop badly-sorted imports
getting re-introduced.
Chosen style is ‘Vertical Hanging Indent’ with trailing commas, because
I think it gives the cleanest diffs, eg:
```
from third_party import (
lib1,
lib2,
lib3,
lib4,
)
```
1. https://pypi.python.org/pypi/isort
When we’re doing user research we often:
- start the task by inviting the participant to a service on Notify
- have them use a prototype version of the admin app, hosted on a
different domain
Currently we can’t do both of these things together, because the invite
emails always send people to notifications.service.gov.uk (because it’s
the API that sends the emails, and the prototype admin app points at the
production API).
This commit changes the admin app to tell the API which host to use when
creating the invite links.
Depends on:
- [ ] https://github.com/alphagov/notifications-api/pull/1515
