Red migration notice should be printed when running tests without --verbosity=2

[Peter Schmidt]

The following quite useful red NOTICE is printed to the command line only when running manage.py test --verbosity=2 --keepdb (the second time after no migrations are run), and thus buried amongst a lot of other information:
​https://github.com/django/django/blob/master/django/core/management/commands/migrate.py#L183-191

Your models have changes that are not yet reflected in a migration, and so won't be applied.
Run 'manage.py makemigrations' to make new migrations, and then re-run 'manage.py migrate' to apply them.

I think it should be printed at the default manage.py test (i.e. --verbosity=1).

This might be complicated by decrementing the verbosity by 1 when calling migrate inside create_test_db:
​https://github.com/django/django/blob/master/django/db/backends/base/creation.py#L68

Though there are only 16 verbosity strings in migrate.py (including calls to showmigrations and emit_pre_migrate_signal) so the side effects from that part should be reasonably traceable.

Not sure about not printing the first time (i.e. without --keepdb) ... any thoughts?