Fix for issue 1633 (JMX port should be disabled by default)

Considering the limited added value that the JMX port will provide on 1.0 and the fact that we do not want to expose it on the QuickSetup, in the admin group we consider to disable this port by default.  Before committing a fix for this maybe we should send a Heads Up message to the users mailing list.

Basically after the changes the JMX connection handler will not be enabled if the server is installed using the graphical setup.  For the command line setup, JMX will not be enabled unless the user explicitly includes de -x option (for the JMX port) when invoking the command-line.