instack-undercloud is no longer in use by the TripleO project. Removing
the code to avoid confusion. Stable branches will continue to be
maintained for their life however no new features should be added.
Change-Id: I63a813c7c1ffd30ca30017133d31a497b77a9a4d
Blueprint: remove-instack-undercloud
Changing the ctlplane IP after an undercloud has been installed
causes various difficult to solve problems, and doesn't work
properly in any case. Let's explicitly disallow it during the
config validation before we start reconfiguring services and break
something.
Note that this also prevents accidental changes due to the new
default CIDR in this release.
Change-Id: I7f3a436b0a4e44fdc1241ebd52003ec9f659e8ea
Closes-Bug: 1645267