ReplicationCliMain.java: code cleanup

In promptIfRequired() methods, replaced the use of "cancelled" local boolean variable with early exits.
In both methods from OperationBetweenSourceAndDestinationServers, reverted the meaning of the returned boolean value.
Extracted methods setConnectionDetails(), initializeGlobalArguments(), initializeFirstConnection(), initializeConnection2(),
  getPwdFile(), initializeDestinationConnection(), getHostPort(LDAPConnectionConsoleInteraction) and getHostPort2(LDAPConnectionConsoleInteraction).