JBIDE-18183 - JMX UI api enhancement for use by fuse, customize image pe...

...r connection rather than per provider
It says WizardPageList because I created an ArrayList one line above named WizardPageList.  In the past, the only children of this extension point were all wizard pages. Now, the extension point allows for one label provider. So, I add all children and then remove the one label-provider element, leaving the wizard page list full of only IConfigurationElement objects that represent wizard pages.