Remove __all__ declarations

These are not up-to-date most of the time, and don't have any use, as
wildcard imports would not pass flake8 check.

pdc/apps/component/models.py

@@ -20,16 +20,6 @@
 from pdc.apps.release import signals
 
 
-__all__ = [
-    'Upstream',
-    'GlobalComponent',
-    'ReleaseComponent',
-    'BugzillaComponent',
-    'ReleaseComponentGroup',
-    'GroupType'
-]
-
-
 def validate_bc_name(name):
     if "/" in name:
         raise ValidationError("Symbol / is not acceptted as part of bugzilla component's name.")

pdc/apps/component/serializers.py

@@ -32,17 +32,6 @@
 from . import signals
 
 
-__all__ = (
-    'GlobalComponentSerializer',
-    'ReleaseComponentSerializer',
-    'HackedContactSerializer',
-    'UpstreamSerializer',
-    'BugzillaComponentSerializer',
-    'GroupSerializer',
-    'GroupTypeSerializer'
-)
-
-
 def reverse_url(request, view_name, **kwargs):
     return request.build_absolute_uri(reverse(viewname=view_name,
                                               kwargs=kwargs))

pdc/apps/contact/models.py

@@ -9,14 +9,6 @@
 from django.db.models.query import QuerySet
 from django.forms.models import model_to_dict
 
-__all__ = [
-    'Person',
-    'Maillist',
-    'ContactRole',
-    'Contact',
-    'RoleContact',
-]
-
 
 class ContactRole(models.Model):