First-time tutorials import from k/examples (#4353)

This imports the tutorials from kubernetes/examples repository for the first
time. It adds "DO NOT UPDATE" notices and updates some titles. These tutorials
will be maintained at k/examples repository.

Also fixing a bug in the update script (we were inserting the `<!--` comments
before the metadata section on the top, causing articles to render incorrectly).

Signed-off-by: Ahmet Alp Balkan <ahmetb@google.com>

update-imported-tutorials.py

@@ -59,8 +59,8 @@ def main():
 
         print('Processing {0}'.format(dst_path))
         remove_excluded_snippets(dst_path)
-        insert_title(dst_path, new_title)
         insert_do_not_update(dst_path)
+        insert_title(dst_path, new_title)
         print('Processed {0}'.format(dst_path))