Configuration file
 When the main() method of this class is used to start the program, the first
 argument is used as a path to the config file, which will be used to obtain
 configuration information. This file is a Properties file, so keys and
 values are separated by equals (=) and the key/value pairs are separated
 by new lines. The following is a general summary of keys used in the
 configuration file. For full details on this see the documentation in
 docs/index.html
 
 - dataDir - The directory where the ZooKeeper data is stored.
- dataLogDir - The directory where the ZooKeeper transaction log is stored.
- clientPort - The port used to communicate with clients.
- tickTime - The duration of a tick in milliseconds. This is the basic
 unit of time in ZooKeeper.
- initLimit - The maximum number of ticks that a follower will wait to
 initially synchronize with a leader.
- syncLimit - The maximum number of ticks that a follower will wait for a
 message (including heartbeats) from the leader.
- server.id - This is the host:port[:port] that the server with the
 given id will use for the quorum protocol.
 In addition to the config file. There is a file in the data directory called
 "myid" that contains the server id as an ASCII decimal value.