Cleanup & Reorg startup scripts (#691)

* Cleanup & Reorg startup scripts

startup_scripts/420_providers.py

@@ -0,0 +1,19 @@
+import sys
+
+from circuits.models import Provider
+from startup_script_utils import load_yaml, pop_custom_fields, set_custom_fields_values
+
+providers = load_yaml("/opt/netbox/initializers/providers.yml")
+
+if providers is None:
+    sys.exit()
+
+for params in providers:
+    custom_field_data = pop_custom_fields(params)
+
+    provider, created = Provider.objects.get_or_create(**params)
+
+    if created:
+        set_custom_fields_values(provider, custom_field_data)
+
+        print("📡 Created provider", provider.name)