Do not retry resolution_fails() on timeout.

Timeout is an appropriate positive response in resolution_fails().
Retries break the test, which counts "sending packet to 10.53.0.7" lines
in ns1/named.run.

.gitlab-ci.yml

@@ -313,7 +313,7 @@ stages:
     - *setup_interfaces
   script:
     - cd bin/tests/system
-    - make -j${TEST_PARALLEL_JOBS:-1} -k check V=1
+    - while make check V=1 TESTS=legacy; do true; done
     - if git rev-parse > /dev/null 2>&1; then ( ! grep "^I:.*:file.*not removed$" *.log ); fi
     - '( ! grep -F "grep: warning:" *.log )'
   after_script:

bin/tests/system/legacy/tests.sh

@@ -32,7 +32,7 @@ resolution_succeeds() {
 resolution_fails() {
 	_servfail=0
 	_timeout=0
-	$DIG $DIGOPTS +tcp +tries=3 +time=5 @10.53.0.1 ${1} TXT > dig.out.test$n
+	$DIG $DIGOPTS +tcp +time=5 @10.53.0.1 ${1} TXT > dig.out.test$n
 	grep -F "status: SERVFAIL" dig.out.test$n > /dev/null && _servfail=1
 	grep -F "timed out" dig.out.test$n > /dev/null && _timeout=1
 	if [ $_servfail -eq 1 ] || [ $_timeout -eq 1 ]; then