Disable sending activation email also when doing external_auth and setti...

...ng BYPASS_ACTIVATION_EMAIL_FOR_EXTAUTH=True


Sorry for this....it was a previous PR with some discussions, but wrong branch and I was forced to clean my master branch
If you want to do a comparison that spans more than one line, I'd suggest creating a temporary variable and checking that instead:
```python
send_email = (
    not settings.FEATURES.get('AUTOMATIC_AUTH_FOR_TESTING') and
    not settings.FEATURES.get('BYPASS_ACTIVATION_EMAIL_FOR_EXTAUTH') and
    DoExternalAuth
)
if send_email:
    from_address = microsite.get_value(
        # etc...
```