Merge branch '1856-race-in-clear-signing-records-in-dnssec-system-test' into 'master'

Resolve "Race in 'clear signing records' in dnssec system test."

Closes #1856

See merge request !3557

CHANGES

+5415.	[test]		Address race in dnssec system test that led to
+			test failures. [GL #1852]
+
 5414.	[test]		Adjust time allowed for journal truncation to occur
 			in nsupdate system test to avoid test failure.
 			[GL #1855]
 
-5413.	[test]		Address race in autosign system test that lead to
+5413.	[test]		Address race in autosign system test that led to
 			test failures. [GL #1852]
 
 5412.	[bug]		'provide-ixfr no;' fail to return up-to-date responses

bin/tests/system/dnssec/tests.sh

@@ -2650,12 +2650,15 @@ status=$((status+ret))
 
 echo_i "clear signing records ($n)"
 { rndccmd 10.53.0.3 signing -clear all update-nsec3.example > /dev/null; } 2>&1 || ret=1
-sleep 1
-{ rndccmd 10.53.0.3 signing -list update-nsec3.example > signing.out; } 2>&1
-grep -q "No signing records found" signing.out || {
-        ret=1
-        sed 's/^/ns3 /' signing.out | cat_i
+check_no_signing_record_found() {
+  { rndccmd 10.53.0.3 signing -list update-nsec3.example > signing.out; } 2>&1
+  grep -q "No signing records found" signing.out || {
+    sed 's/^/ns3 /' signing.out | cat_i
+    return 1
+  }
+  return 0
 }
+retry_quiet 5 check_no_signing_record_found || ret=1
 n=$((n+1))
 test "$ret" -eq 0 || echo_i "failed"
 status=$((status+ret))