Issue #11941 - reduce logs for DistributionTests

Signed-off-by: Lachlan Roberts <lachlan@webtide.com>

tests/jetty-testers/src/main/java/org/eclipse/jetty/tests/testers/ProcessWrapper.java

@@ -200,7 +200,7 @@ public class ProcessWrapper implements AutoCloseable
                 String line;
                 while ((line = reader.readLine()) != null)
                 {
-                    LOG.info(line);
+                    LOG.debug(line);
                     logs.add(line);
                 }
             }