This patch is a follow-up patch of
8e5e69869d addressing some the remaining
comments after the patch was merged. The changes are:
* Optimize the code by generating the list of reserved words for the
nodes controller only once.
* List the reserved words in the release note.
* Improve the error string when someone tries to name a node using a
reserved word.
* Add a comment for future reference indicating how we should try to
model the API in case a new sub-controller needs to be added to the
nodes controller class.
Change-Id: I43d6d9e2e92cc941a7839c60d9cd361cd94b6208
6be3448d40