totp => otp, integrate with factors, new setup form

passbook/otp/migrations/0001_initial.py

@@ -0,0 +1,28 @@
+# Generated by Django 2.1.7 on 2019-02-25 09:42
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+        ('passbook_core', '0010_auto_20190224_1016'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='OTPFactor',
+            fields=[
+                ('factor_ptr', models.OneToOneField(auto_created=True, on_delete=django.db.models.deletion.CASCADE, parent_link=True, primary_key=True, serialize=False, to='passbook_core.Factor')),
+                ('enforced', models.BooleanField(default=False, help_text='Enforce enabled OTP for Users this factor applies to.')),
+            ],
+            options={
+                'verbose_name': 'OTP Factor',
+                'verbose_name_plural': 'OTP Factors',
+            },
+            bases=('passbook_core.factor',),
+        ),
+    ]