Stop the replaces insanity

This DSL line was introduced only to deal with the renaming of the
"chef-full" artifacts to "chef" back in the dark ages.  It has
been copypasta'd around to other projects to the point where there
was a completely inaccurate @todo added to make replaces default
to a broken configuration.  Very few projects should be using
replaces and including a replaces line which is the same as the
package_name will break RPM upgrades.

Patch validates that replaces != package_name and yells at the
user to knock if off if they're doing that.   Because ARRRRGGGHH.

Just delete the line.  Stop the copypasta errors.