[improve][client] Increase default Java client connectionMaxIdleSecon…

…ds to 60 seconds

- the reason is that the default for autoUpdatePartitionsInterval is 60 seconds and if idle timeout is shorter,
  it causes connections to close and open unnecessarily

pulsar-client/src/main/java/org/apache/pulsar/client/impl/conf/ClientConfigurationData.java

@@ -139,7 +139,7 @@ public class ClientConfigurationData implements Serializable, Cloneable {
             value = "Release the connection if it is not used for more than [connectionMaxIdleSeconds] seconds. "
                     + "If  [connectionMaxIdleSeconds] < 0, disabled the feature that auto release the idle connections"
     )
-    private int connectionMaxIdleSeconds = 25;
+    private int connectionMaxIdleSeconds = 60;
 
     @ApiModelProperty(
             name = "useTcpNoDelay",