Issue #140 - Fedora 24: Bug when try to rename multiple debug reports

Edited gingerbase.host-dashboard.js initReportGrid function to disable
Rename button when the user selects more than one checkbox option.
Button was only disabled in the css before, now it's also disabled when
user clicks in it.

Signed-off-by: Bianca Carvalho <bianca@linux.vnet.ibm.com>

ui/js/src/gingerbase.host-dashboard.js

@@ -74,7 +74,7 @@ gingerbase.init_dashboard = function() {
                 disabled: true,
                 onClick: function(event) {
                     var report = reportGrid.getSelected();
-                    if (!report) {
+                    if (!report || report.length > 1){
                         return;
                     }
                     gingerbase.selectedReport = report[0]['name'];