[Skiboot] skiboot v6.0.19 released

[Stewart Smith]

skiboot-6.0.19
**************

skiboot 6.0.19 was released on Tuesday March 19th, 2019. It replaces
skiboot-6.0.18 as the current stable release in the 6.0.x series.

It is recommended that 6.0.19 be used instead of any previous 6.0.x
version due to the bug fixes it contains.

Bug fixes included in this release are:

* p9dsu: Undo slot label name changes

  During some code updates the slot labels were updated to reflect the
  phb layout, however expectations were that the slot labels be
  aligned with the riser card slots and not the system planar slots.

  [stewart: The tale of how we got here is long and varied and not at
  all clear. The first ESS systems went out with a skiboot v5.9.8 with
  additional SuperMicro patches. It was probably a slot table, but who
  knows, we don't have the code so can't check. It's possible it was
  all coming in through HDAT instead). The op-build tree (thus the
  exact patches) shipped on systems that work correct seems to not be
  around anywhere anymore (if it ever was). It was only in skiboot
  v6.0 that a slot table made it in, and, of course, only having
  remote machines in random configs, including possibly with riser
  cards from Briggs&Stratton rather than the ones destined for this
  system, doesn't make for verifying this at all. It also doesn't help
  that *consistently* there is *never* any review on slot tables, and
  we've had things be wrong in the past. Combine this with not
  upstream Hostboot patches.]

* p9dsu: Fix slot labels for p9dsu2u

  Update the slot labels for the p9dsu2u tables.

-- 
Stewart Smith
OPAL Architect, IBM.