scripts/test-schema: A *very* basic script to see if a schema works

* It's using `sys.argv`, not `argparse`.
* Thus there's no `--help`.
* Supply it with: 1) Filename of a schema definition, 2) filename of a full
  EDDN message text to test for compliance.
* No output if both schema and message load *and* the message passes the
  schema.  Else you'll get python exception output from `jsonschema.validate()`.

scripts/test-schema.py

@@ -0,0 +1,17 @@
+import sys
+
+import simplejson
+import jsonschema
+
+schema_filename = sys.argv[1]
+message_filename = sys.argv[2]
+
+schema_file = open(schema_filename, 'r')
+schema_data = schema_file.read()
+schema = simplejson.loads(schema_data)
+
+message_file = open(message_filename, 'r')
+message_data = message_file.read()
+message = simplejson.loads(message_data)
+
+jsonschema.validate(message, schema, format_checker=jsonschema.FormatChecker())