Apply stderrAllowRe to non-error log statements

test/integration/error_spam_test.go

@@ -68,12 +68,8 @@ func TestErrorSpam(t *testing.T) {
 	stderr := rr.Stderr.String()
 
 	for _, line := range strings.Split(stderr, "\n") {
-		if strings.HasPrefix(line, "E") {
-			if stderrAllowRe.MatchString(line) {
-				t.Logf("acceptable stderr: %q", line)
-				continue
-			}
-			t.Errorf("unexpected error log: %q", line)
+		if stderrAllowRe.MatchString(line) {
+			t.Logf("acceptable stderr: %q", line)
 			continue
 		}