Code cleanups


ReplicationCliArgumentParser.java:
Extracted static class ServerArgs to separate fields named "*1" and "*2" + removed many methods.
Removed all fields named "*1" and "*2" and added fields server1 and server2 to replace them.
Extracted methods createServerArgs1() and createServerArgs2().

ReplicationCliMain.java:
In setConnectionDetails() and setReplicationDetails(), reduced number of parameters.
Extracted methods getReplicationPortArg() and newBooleanArgument().