GEODE-2644: Remove log level from MonitorQueryUnderContentionBenchmark

Remove log level manipulation from benchmark. The internal API that was
being used has been deleted and it only altered the log level of one
logger: Cache.getLogger, so the impact of this is neglible.

geode-core/src/jmh/java/org/apache/geode/cache/query/internal/MonitorQueryUnderContentionBenchmark.java

@@ -35,7 +35,6 @@
 import org.openjdk.jmh.annotations.TearDown;
 
 import org.apache.geode.internal.cache.InternalCache;
-import org.apache.geode.internal.logging.LogService;
 
 @State(Scope.Thread)
 @Fork(1)
@@ -88,14 +87,9 @@ public class MonitorQueryUnderContentionBenchmark {
   private DefaultQuery query;
   private Random random;
   private ScheduledThreadPoolExecutor loadGenerationExecutorService;
-  private org.apache.logging.log4j.Level originalBaseLogLevel;
 
   @Setup(Level.Trial)
   public void trialSetup() throws InterruptedException {
-
-    originalBaseLogLevel = LogService.getBaseLogLevel();
-    LogService.setBaseLogLevel(org.apache.logging.log4j.Level.OFF);
-
     queryMonitor =
         new QueryMonitor((ScheduledThreadPoolExecutor) Executors.newScheduledThreadPool(1),
             mock(InternalCache.class), QUERY_MAX_EXECUTION_TIME);
@@ -134,8 +128,6 @@ public void trialSetup() throws InterruptedException {
   public void trialTeardown() {
     loadGenerationExecutorService.shutdownNow();
     queryMonitor.stopMonitoring();
-
-    LogService.setBaseLogLevel(originalBaseLogLevel);
   }
 
   @Benchmark