Remove deprecated CONF.fixed_range

This was deprecated in Grizzly, and the TODO said remove for Havana.
fixed_range was deprecated in I4ec111079f7a1d253190e6a6008048f992a53f68

DocImpact: Remove deprecated config option

Change-Id: I1f429de7a7091adbd3a178d287b3a90e02664450
Merge "Remove deprecated CONF.fixed_range"