Rename vacuum_cost_naptime to vacuum_cost_delay, with agreement from Jan.

Bruce Momjian <bruce@momjian.us>

Commit: 0307c09cf5ef1056e74d9e3b3e9682410aa25bc6
Author: Bruce Momjian <bruce@momjian.us>
Date: 2004-08-06T04:15:09Z
Releases: 8.0.0
Rename vacuum_cost_naptime to vacuum_cost_delay, with agreement from Jan.

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