Forgot to specify the expected-exit-code for the dbmonitor.

An unexpected exit code will cause the __all_programs HALT event to
fail and cause "Stop Run" to fail.

pelab/auto-pelab.tm

@@ -395,6 +395,7 @@ if {$USE_DBMONITOR} {
     set dbmonitor [new Program $ns]
     $dbmonitor set node "ops"
     $dbmonitor set command "/usr/testbed/sbin/dbmonitor.pl -i $DBMONITOR_INTERVAL $pid $eid"
+    $dbmonitor set expected-exit-code $ecode
     set monitorlist $dbmonitor
 }