Create doc-exports metadata generator script

- add script to generate metadata file for doc-exports repository
- fix metadata issues which became visible with that script

tools/generate_docexports_data.py

@@ -0,0 +1,21 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+import sys
+
+from ruamel.yaml import YAML
+
+import otc_metadata.services
+
+
+def main():
+    data = otc_metadata.services.Services()
+
+    _yaml = YAML()
+    _yaml.indent(mapping=2, sequence=4, offset=2)
+    filepath = sys.stdout
+    sys.stdout.write('# Auto-generated by otc_metadata.generate_docexports.data\n')
+    _yaml.dump(data.docs_html_by_category('internal'), sys.stdout)
+
+if __name__ == '__main__':
+    main()