Add Cookie to LocalBookie

[yaalsn]

Motivation

I tried to use command bin/bookkeeper shell listbookies -a to get all bookies from localbookie, it raised error

ERROR Fail to process command 'list'
org.apache.bookkeeper.client.BKException$ZKException: Error while using ZooKeeper
        at org.apache.bookkeeper.discover.ZKRegistrationClient.lambda$getChildren$4(ZKRegistrationClient.java:352) ~[bookkeeper-server-4.17.0-SNAPSHOT.jar:4.17.0-SNAPSHOT]
        at org.apache.bookkeeper.zookeeper.ZooKeeperClient$25$1.processResult(ZooKeeperClient.java:1177) ~[bookkeeper-server-4.17.0-SNAPSHOT.jar:4.17.0-SNAPSHOT]
        at org.apache.zookeeper.ClientCnxn$EventThread.processEvent(ClientCnxn.java:668) ~[zookeeper-3.8.1.jar:3.8.1]
        at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:553) ~[zookeeper-3.8.1.jar:3.8.1]
Caused by: org.apache.zookeeper.KeeperException$NoNodeException: KeeperErrorCode = NoNode for /ledgers/cookies
        at org.apache.zookeeper.KeeperException.create(KeeperException.java:118) ~[zookeeper-3.8.1.jar:3.8.1]
        at org.apache.zookeeper.KeeperException.create(KeeperException.java:54) ~[zookeeper-3.8.1.jar:3.8.1]
        at org.apache.bookkeeper.discover.ZKRegistrationClient.lambda$getChildren$4(ZKRegistrationClient.java:351) ~[bookkeeper-server-4.17.0-SNAPSHOT.jar:4.17.0-SNAPSHOT]
        ... 3 more

The reason is that no /ledgers/cookies are created in ZK when starting the local bk server. After applying this change, the command works.