12.0.x Remove usage of Slf4j fluent api (#14642)

* Remove usage of Slf4j fluent api

Signed-off-by: Olivier Lamy <olamy@apache.org>

Author: olamy

jetty-core/jetty-io/src/main/java/org/eclipse/jetty/io/NegotiatingClientConnection.java

@@ -110,7 +110,8 @@ else if (filled == 0)
 
         if (failure != null)
         {
-            LOG.atDebug().setCause(failure).log("Unable to fill from endpoint");
+            if (LOG.isDebugEnabled())
+                LOG.debug("Unable to fill from endpoint", failure);
             close();
             failConnectionPromise(failure);
         }

jetty-core/jetty-server/src/main/java/org/eclipse/jetty/server/internal/HttpChannelState.java

@@ -1585,7 +1585,7 @@ private void completeChannelCallback(Throwable failure)
                     else if (failure != null && unconsumed != null)
                         ExceptionUtil.addSuppressedIfNotAssociated(failure, unconsumed);
                     if (LOG.isDebugEnabled())
-                        LOG.atDebug().setCause(failure).log("consumeAvailable: {} {}", unconsumed == null, httpChannelState);
+                        LOG.debug("consumeAvailable: {} {}", unconsumed == null, httpChannelState, failure);
                 }
 
                 // Pending writes are also failures

tests/test-distribution/test-distribution-common/src/test/java/org/eclipse/jetty/tests/distribution/DistributionTests.java

@@ -419,7 +419,7 @@ public void testLog4j2ModuleWithSimpleWebAppWithJSP(String env) throws Exception
         {
             assertTrue(run1.awaitForStart());
             assertEquals(0, run1.getExitValue());
-            LOG.atInfo().setMessage(run1.logs().get()).log();
+            LOG.info(run1.logs().get());
             assertTrue(Files.exists(distribution.getJettyBase().resolve("resources/log4j2.xml")));
 
             Path war = distribution.resolveArtifact("org.eclipse.jetty." + env + ".demos:jetty-" + env + "-demo-jsp-webapp:war:" + jettyVersion);