Revert "Fix oslo-config value substitution"

This reverts commit 2405d366ba00c1559014e2f00f68387d6b5646ab.

Reason for revert: Incorrect reason for doing this patch was provided by me. 
Old version of oslo.config made collision.

Change-Id: I71e2fd55cdbe3ecf68672da9bfa270caf4f80fce
1 file changed