Instance wizard: Add 'deployVirtualMachine' event hook

For UI plugin development, add new event
'cloudStack.deployVirtualMachine'

-- This passes the wizard form data and all parameters that will be
   passed to deployVirtualMachine; allows plugin to extend data to pass
   additonal data automatically (i.e, custom form fields)

ui/scripts/instanceWizard.js

@@ -895,6 +895,11 @@
             	});
             }
 
+            $(window).trigger('cloudStack.deployVirtualMachine', {
+                deployVmData: deployVmData,
+                formData: args.data
+            });
+
             $.ajax({
                 url: createURL('deployVirtualMachine'),
                 data: deployVmData,