Disable Zookeeper multi address (#855)

Motivation:

Zookeeper 3.6 added a new option that was ability to set multiple adders
for quorum operations. apache/zookeeper#1048 The
multi address was not compatible with the old protocol used in ZooKeeper
3.5.x, so apache/zookeeper#1251 has disabled the
option.

During fixing incompatibility in
apache/zookeeper#1251, it omitted to change the
default value of `QuorumPeer.multiAddressEnabled` to `false`.

https://github.com/apache/zookeeper/blob/e08cc2a782982964a57651f179a468b19e2e6010/zookeeper-server/src/main/java/org/apache/zookeeper/server/quorum/QuorumPeer.java#L174-L180
The default is correctly set to false when a Zookeeper server is used as
a standalone mode. However, if a new `QuorumPeer` instance is manually
created, it will remain `true.`

Since CentralDogma directly extends `QuorumPeer`,
`zookeeper.multiadress` is activated automatically and Central Dogma
using Zookeeper 3.5.x can't be upgraded with a rolling deployment.

Modifications:

- Set `multiAddressEnabled` to false when creating `EmbeddedZooKeeper`

Result:

- Fixed an issue where CentralDogma does not perform rolling updates due
to the invalid protocol version of Zookeeper.
  - Note that this bug affects 0.61.2, 0.61.3 and 0.61.4

server/src/main/java/com/linecorp/centraldogma/server/internal/replication/EmbeddedZooKeeper.java

@@ -78,6 +78,7 @@ final class EmbeddedZooKeeper extends QuorumPeer {
         setLearnerType(zkCfg.getPeerType());
         setSyncEnabled(zkCfg.getSyncEnabled());
         setQuorumListenOnAllIPs(zkCfg.getQuorumListenOnAllIPs());
+        setMultiAddressEnabled(false);
 
         configureSasl();