Remove the old templating system (#3445)

* Inline resolve_references in dump-swagger

Since this is the only bit of the old templating system we still use, let's
inline it.

OrederedLoader and OrderedDict are now redundant, because all dicts in Python
preserve insertion order.

* Remove the old templating system

We've now replaced the old templates with hugo, so we can get rid of this mess.

scripts/dump-swagger.py

@@ -30,12 +30,29 @@ import yaml
 
 
 scripts_dir = os.path.dirname(os.path.abspath(__file__))
-templating_dir = os.path.join(scripts_dir, "templating")
 api_dir = os.path.join(os.path.dirname(scripts_dir), "data", "api")
 
-sys.path.insert(0, templating_dir)
+def resolve_references(path, schema):
+    if isinstance(schema, dict):
+        # do $ref first
+        if '$ref' in schema:
+            value = schema['$ref']
+            path = os.path.join(os.path.dirname(path), value)
+            with open(path, encoding="utf-8") as f:
+                ref = yaml.safe_load(f)
+            result = resolve_references(path, ref)
+            del schema['$ref']
+        else:
+            result = {}
+
+        for key, value in schema.items():
+            result[key] = resolve_references(path, value)
+        return result
+    elif isinstance(schema, list):
+        return [resolve_references(path, value) for value in schema]
+    else:
+        return schema
 
-from matrix_templates import units
 
 parser = argparse.ArgumentParser(
     "dump-swagger.py - assemble the Swagger specs into a single JSON file"
@@ -103,7 +120,7 @@ for filename in os.listdir(cs_api_dir):
     print("Reading swagger API: %s" % filepath)
     with open(filepath, "r") as f:
         api = yaml.safe_load(f.read())
-        api = units.resolve_references(filepath, api)
+        api = resolve_references(filepath, api)
 
         basePath = api['basePath']
         for path, methods in api["paths"].items():