These settings are all legacy, as for some time heat has instead supported
deriving the URLs internally using the endpoints from the keystone catalog.
Defaulting these to localhost seems like a bad default, as in
most cases heat will caclulate a more reasonable default (e.g something
derived from the actual heat public endpoint in keystone), and it's somewhat
surprising when you don't pass a value and get localhost instead of the heat
defaults.
They can still be used to override the keystone endpoint, which is sometimes
useful, but in most cases these should no longer be set IMO.
Note the relevant heat commits which make these settings optional are
Id402664e38e3da071ad634233b3a1f8e13af152d and
If8a2d3f37d87c26228e709c20f61969b397f2da0 (present in all Heat releases
since Mitaka)
Closes-Bug: #1641873
Change-Id: I90ccdd881a41d803e28064f44b821ab48a6fa8ea
6e8ef40483