Adding EULA checkbox in license modal

Added the EULA text and checkbox on the UI. We received the shortened text from Rob Nalen

awx/ui/static/less/ansible-ui.less

@@ -360,6 +360,10 @@ textarea.allowresize {
   color: @grey-txt;
 }
 
+#license_eula{
+  white-space: nowrap;
+}
+
 .modal-dialog .ui-accordion .ui-accordion-content {
   overflow: hidden;
 }