fix error when no dep dropwizard java.lang.NoClassDefFoundError: com/…

[songxiaosheng]

fix follow error

Exception in thread "ZooKeeper Server Starter" java.lang.NoClassDefFoundError: com/codahale/metrics/Reservoir
	at org.apache.zookeeper.metrics.impl.DefaultMetricsProvider$DefaultMetricsContext.lambda$getSummary$2(DefaultMetricsProvider.java:126)
	at java.base/java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1713)
	at org.apache.zookeeper.metrics.impl.DefaultMetricsProvider$DefaultMetricsContext.getSummary(DefaultMetricsProvider.java:122)
	at org.apache.zookeeper.server.ServerMetrics.<init>(ServerMetrics.java:74)
	at org.apache.zookeeper.server.ServerMetrics.<clinit>(ServerMetrics.java:44)
	at org.apache.zookeeper.server.ZooKeeperServerMain.runFromConfig(ZooKeeperServerMain.java:133)
	at org.apache.dubbo.springboot.demo.provider.EmbeddedZooKeeper$ServerRunnable.run(EmbeddedZooKeeper.java:249)
	at java.base/java.lang.Thread.run(Thread.java:1575)
Caused by: java.lang.ClassNotFoundException: com.codahale.metrics.Reservoir
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:528)
	... 8 

[tisonkun]

Please revert unrelated style changes.