[ironic] Stable & Bugfix branch maintenance and retirement

Hi folks,

I'm letting you all know it's my intention to, very soon, perform the following actions on all Ironic projects:

1) Perform a release for any maintained stable and bugfix branches (EM stable branches excluded by policy) 2) Retire all stable branches for releases prior to stable/train (For Ironic; this is queens, rocky, and stein -- I have not enumerated them yet for other projects).

If you either have code you'd like to ensure gets in the stable release or want to step up and volunteer to maintain the older branches -- including backporting existing bugfixes that did not make it back that far and maintaining CI -- please let me know within the next couple of days.

Thanks, Jay Faulkner OpenStack Ironic PTL OpenStack TC member