Add function to load YAML files

This commit starts to remove some code redundancy from the startup
scripts for easier maintenance.

startup_scripts/030_regions.py

@@ -1,31 +1,26 @@
 from dcim.models import Region
-from ruamel.yaml import YAML
-from pathlib import Path
+from startup_script_utils import load_yaml
 import sys
 
-file = Path('/opt/netbox/initializers/regions.yml')
-if not file.is_file():
+regions = load_yaml('/opt/netbox/initializers/regions.yml')
+
+if regions is None:
   sys.exit()
 
-with file.open('r') as stream:
-  yaml=YAML(typ='safe')
-  regions = yaml.load(stream)
+optional_assocs = {
+  'parent': (Region, 'name')
+}
 
-  optional_assocs = {
-    'parent': (Region, 'name')
-  }
+for params in regions:
 
-  if regions is not None:
-    for params in regions:
+  for assoc, details in optional_assocs.items():
+    if assoc in params:
+      model, field = details
+      query = { field: params.pop(assoc) }
 
-      for assoc, details in optional_assocs.items():
-        if assoc in params:
-          model, field = details
-          query = { field: params.pop(assoc) }
+      params[assoc] = model.objects.get(**query)
 
-          params[assoc] = model.objects.get(**query)
+  region, created = Region.objects.get_or_create(**params)
 
-      region, created = Region.objects.get_or_create(**params)
-
-      if created:
-        print("🌐 Created region", region.name)
+  if created:
+    print("🌐 Created region", region.name)