Switch angellist tests to OAuth2TestsMixin.
Switch angellist tests to OAuth2TestsMixin.

This is a fixup for #1214 because I had an unsaved file in my editor.
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nimbis/django-allauth,spool/django-allauth,pennersr/django-allauth,AltSchool/django-allauth,wli/django-allauth,pztrick/django-allauth,lukeburden/django-allauth,bjorand/django-allauth,bittner/django-allauth,agriffis/django-allauth,pennersr/django-allauth,AltSchool/django-allauth,joshowen/django-allauth,pztrick/django-allauth,bittner/django-allauth,spool/django-allauth,rsalmaso/django-allauth,joshowen/django-allauth,jwhitlock/django-allauth,rsalmaso/django-allauth,lukeburden/django-allauth,pennersr/django-allauth,joshowen/django-allauth,bjorand/django-allauth,wli/django-allauth,bittner/django-allauth,lukeburden/django-allauth,spool/django-allauth,nimbis/django-allauth,wli/django-allauth,jwhitlock/django-allauth,pztrick/django-allauth,agriffis/django-allauth,agriffis/django-allauth,rsalmaso/django-allauth,bjorand/django-allauth,nimbis/django-allauth,AltSchool/django-allauth,jwhitlock/django-allauth