Help for ironic commands was changed to show any required arguments
in a different section from the optional arguments in
b0641b1d996e78d6f771e3c635d684c27988bf37.
The release note is updated to clarify that this change would
be for any command, even though only two are affected by it now.
Change-Id: I9a69b3762bf9d08985d512f7ddf806e0d0d24929
The aim of this patch is to improve commands 'ironic help node-create'
and 'ironic help port-create' so that the required arguments are
listed in a dedicated section, but not in section 'optional arguments'.
Change-Id: I73e0179170b3bb446bd9b14b095eac8ce8b5924b
Closes-Bug: #1518959