debuginfod: Minor run-debuginfod-find.sh test fixes

$PORT3's metrics are not reported on error and $PID4 was not properly
killed. This patch addresses both of those issues by reporting the
metrics of $PORT3 as $PORT1 and $PORT2 were in err() and waiting for
$PID4 to terminate before continuing with the test.

Signed-off-by: Noah Sanci <nsanci@redhat.com>
diff --git a/tests/ChangeLog b/tests/ChangeLog
index 1196d6b..51ae44e 100644
--- a/tests/ChangeLog
+++ b/tests/ChangeLog
@@ -1,3 +1,8 @@
+2021-07-21  Noah Sanci <nsanci@redhat.com>
+
+	* run-debuginfod-find.sh: Properly kill $PID4 by waiting for it to
+	finish. Report $PORT3's metrics in err().
+
 2021-06-28  Noah Sanci <nsanci@redhat.com>
 
 	PR25978
diff --git a/tests/run-debuginfod-find.sh b/tests/run-debuginfod-find.sh
index 1d664be..b65f358 100755
--- a/tests/run-debuginfod-find.sh
+++ b/tests/run-debuginfod-find.sh
@@ -54,7 +54,7 @@
 errfiles_list=
 err() {
     echo ERROR REPORTS
-    for ports in $PORT1 $PORT2
+    for ports in $PORT1 $PORT2 $PORT3
     do
         echo ERROR REPORT $port metrics
         curl -s http://127.0.0.1:$port/metrics
@@ -754,6 +754,8 @@
 wait_ready $PORT3 'groom{statistic="files scanned (mb)"}' 0
 
 kill $PID4
+wait $PID4
+PID4=0
 
 ########################################################################
 # set up tests for retrying failed queries.