Command to reset unverifiable main characters.

Include section in upgrade docs to run this command and the service account validation one.

allianceauth/authentication/management/commands/checkmains.py

@@ -0,0 +1,20 @@
+from django.core.management.base import BaseCommand
+from allianceauth.authentication.models import UserProfile
+
+
+class Command(BaseCommand):
+    help = 'Ensures all main characters have an active ownership'
+
+    def handle(self, *args, **options):
+        profiles = UserProfile.objects.filter(main_character__isnull=False).filter(
+            main_character__character_ownership__isnull=True)
+        if profiles.exists():
+            for profile in profiles:
+                self.stdout.write(self.style.ERROR(
+                    '{0} does not have an ownership. Resetting user {1} main character.'.format(profile.main_character,
+                                                                                                profile.user)))
+                profile.main_character = None
+                profile.save()
+            self.stdout.write(self.style.WARNING('Reset {0} main characters.'.format(profiles.count())))
+        else:
+            self.stdout.write(self.style.SUCCESS('All main characters have active ownership.'))