ZOOKEEPER-4465: zooinspector logback pattern config add escape for '(' and ')'

zooinspect logback config file `logback.xml` currently use a pattern of this
`<pattern>%5p [%t] (%F:%L) - %m%n</pattern> `
which not escape the '(' and ')', cause logback to ignore parts after ')'.

according to logback documents, '(' and ')' is used for grouping, need escape by `\` if used as normal char
https://logback.qos.ch/manual/layouts.html#grouping

this pr update it to (add '\' to escape)
`<pattern>%5p [%t] \(%F:%L\) - %m%n</pattern> `

Author: 67 <67@gd67.com>

Reviewers: Enrico Olivelli <eolivelli@apache.org>, Andor Molnar <andor@apache.org>, Mate Szalay-Beko <symat@apache.org>

Closes #1814 from iamgd67/ZOOKEEPER-4465

zookeeper-contrib/zookeeper-contrib-zooinspector/src/main/resources/logback.xml

@@ -22,7 +22,7 @@
 <configuration>
   <appender name="stdout" class="ch.qos.logback.core.ConsoleAppender">
     <encoder>
-      <pattern>%5p [%t] (%F:%L) - %m%n</pattern>
+      <pattern>%5p [%t] \(%F:%L\) - %m%n</pattern>
     </encoder>
   </appender>
   <root level="INFO">

zookeeper-contrib/zookeeper-contrib-zooinspector/src/test/java/org/apache/zookeeper/inspector/LoggerTest.java

@@ -0,0 +1,48 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.zookeeper.inspector;
+
+import org.junit.Assert;
+import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.ByteArrayOutputStream;
+import java.io.PrintStream;
+import java.nio.charset.StandardCharsets;
+
+public class LoggerTest {
+    Logger LOG = LoggerFactory.getLogger(LoggerTest.class);
+    String testMessage = "a test message";
+
+    @Test
+    public void testLogStdOutConfig() {
+        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
+        PrintStream realStdOut = System.out;
+        System.setOut(new PrintStream(byteArrayOutputStream));
+        LOG.info(testMessage);
+        System.setOut(realStdOut);
+
+        //log to stdout for debug
+        LOG.info(testMessage);
+        String bufferMessage = new String(byteArrayOutputStream.toByteArray(), StandardCharsets.UTF_8);
+        LOG.info(bufferMessage);
+
+        Assert.assertTrue(bufferMessage.contains(testMessage));
+    }
+}