Remove all "traces" of trace_userlocks, because userlocks were removed

Bruce Momjian <bruce@momjian.us>

Commit: 0180bd6180511875db046bf8ddcaa633a2952dfd
Author: Bruce Momjian <bruce@momjian.us>
Date: 2011-10-13T23:59:57Z
Releases: 9.2.0
Remove all "traces" of trace_userlocks, because userlocks were removed
in PG 8.2.

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