Remove endpoint_substitution_whitelist config option

The endpoint_substitution_whitelist was actually scheduled to be
removed in Juno.

The whitelisted substitution items are the same as was the default
in previous releases.

bp removed-as-of-kilo
DocImpact

Change-Id: Ia9cc6e3c9807e00e7291cf9bb2f3451fbe2bf94f
Updated from global requirements

Change-Id: I772f2984868c434c16e8d6992537aa47b7646303
Merge "Remove endpoint_substitution_whitelist config option"
Merge "Updated from global requirements"