HBASE-21727 Simplify documentation around client timeout - ADDENDUM

Add back HBaseConfiguration#getInt with deprecation

Signed-off-by: zhangduo <zhangduo@apache.org>

hbase-common/src/main/java/org/apache/hadoop/hbase/HBaseConfiguration.java

@@ -169,6 +169,32 @@ public class HBaseConfiguration extends Configuration {
     return isShowConf;
   }
 
+  /**
+   * Get the value of the <code>name</code> property as an <code>int</code>, possibly referring to
+   * the deprecated name of the configuration property. If no such property exists, the provided
+   * default value is returned, or if the specified value is not a valid <code>int</code>, then an
+   * error is thrown.
+   * @param name property name.
+   * @param deprecatedName a deprecatedName for the property to use if non-deprecated name is not
+   *          used
+   * @param defaultValue default value.
+   * @throws NumberFormatException when the value is invalid
+   * @return property value as an <code>int</code>, or <code>defaultValue</code>.
+   * @deprecated it will be removed in 3.0.0. Use
+   *             {@link Configuration#addDeprecation(String, String)} instead.
+   */
+  @Deprecated
+  public static int getInt(Configuration conf, String name,
+      String deprecatedName, int defaultValue) {
+    if (conf.get(deprecatedName) != null) {
+      LOG.warn(String.format("Config option \"%s\" is deprecated. Instead, use \"%s\""
+        , deprecatedName, name));
+      return conf.getInt(deprecatedName, defaultValue);
+    } else {
+      return conf.getInt(name, defaultValue);
+    }
+  }
+
   /**
    * Get the password from the Configuration instance using the
    * getPassword method if it exists. If not, then fall back to the