[INLONG-74] minor updates for DefaultBdbStoreService

[dockerzhang]

1. fix typo
BDB_TOPIC_AUTHCONTROL_STORE_NAME -> BDB_TOPIC_AUTH_CONTROL_STORE_NAME
tmpbdbEntity -> tmpBdbEntity
2. HelperNode is dynamic :

Set helpers = new HashSet();
InetSocketAddress helper1 = new InetSocketAddress(this.nodeHost, 9005);
InetSocketAddress helper2 = new InetSocketAddress(this.nodeHost, 9006);
InetSocketAddress helper3 = new InetSocketAddress(this.nodeHost, 9007);
helpers.add(helper1);
helpers.add(helper2);
helpers.add(helper3);

to

for(int i = 1; i <= 3; i++){
    InetSocketAddress helper = new InetSocketAddress(this.nodeHost, bdbConfig.getBdbNodePort() + i);
    helpers.add(helper);
}

3. add volatile
change

 private boolean isMaster;

to

private volatile boolean isMaster;

4. remove isStopped and param of getEnvironment

JIRA link - [INLONG-74] created by technoboy