Cleanup & Reorg startup scripts (#691)

* Cleanup & Reorg startup scripts

startup_scripts/170_manufacturers.py

@@ -0,0 +1,15 @@
+import sys
+
+from dcim.models import Manufacturer
+from startup_script_utils import load_yaml
+
+manufacturers = load_yaml("/opt/netbox/initializers/manufacturers.yml")
+
+if manufacturers is None:
+    sys.exit()
+
+for params in manufacturers:
+    manufacturer, created = Manufacturer.objects.get_or_create(**params)
+
+    if created:
+        print("🏭 Created Manufacturer", manufacturer.name)