fix: Print decoded key and fully clean up test nomcom (#6094)

* fix: Delete Person records when deleting a test nomcom

* fix: Decode test nomcom private key before printing

ietf/nomcom/management/commands/create_test_nomcom.py

@@ -11,7 +11,7 @@
 from ietf.nomcom.factories import nomcom_kwargs_for_year, NomComFactory, NomineePositionFactory, key
 from ietf.person.factories import EmailFactory
 from ietf.group.models import Group
-from ietf.person.models import User
+from ietf.person.models import Person, User
 
 class Command(BaseCommand):
     help = ("Create (or delete) a nomcom for test and development purposes.")
@@ -27,7 +27,9 @@ def handle(self, *args, **options):
         if opt_delete:
             if Group.objects.filter(acronym='nomcom7437').exists():
                 Group.objects.filter(acronym='nomcom7437').delete()
-                User.objects.filter(username__in=['testchair','testmember','testcandidate']).delete()
+                users_to_delete = ['testchair','testmember','testcandidate']
+                Person.objects.filter(user__username__in=users_to_delete).delete()
+                User.objects.filter(username__in=users_to_delete).delete()
                 self.stdout.write("Deleted test group 'nomcom7437' and its related objects.")
             else:
                 self.stderr.write("test nomcom 'nomcom7437' does not exist; nothing to do.\n")
@@ -57,6 +59,6 @@ def handle(self, *args, **options):
                                        position__nomcom=nc, position__name='Test Area Director', position__is_iesg_position=True,
                                       )
 
-                self.stdout.write("%s\n" % key)
+                self.stdout.write("%s\n" % key.decode())
                 self.stdout.write("Nomcom 7437 created. The private key can also be found at any time\nin ietf/nomcom/factories.py. Note that it is NOT a secure key.\n")