remove usage of import * and enforce F405 in our linter

import * is a scourge upon the earth

tools/data_generators/rbac_dummy_data_generator.py

@@ -38,7 +38,12 @@ django.setup() # noqa
 from django.db import transaction # noqa
 
 # awx
-from awx.main.models import * # noqa
+from awx.main.models import (  # noqa
+    Credential, CredentialType, Group, Host, Inventory, Job, JobEvent,
+    JobHostSummary, JobTemplate, Label, Organization, PrimordialModel, Project,
+    Team, User, WorkflowJobTemplate, WorkflowJobTemplateNode,
+    batch_role_ancestor_rebuilding,
+)
 from awx.main.signals import ( # noqa
     disable_activity_stream,
     disable_computed_fields