allow to change the icon size of the node overview table (#8802)

make icon size of node overview page changeable

similar to the list of projects on the start page of Jenkins the
icon size of the overview page of nodes can now be changed.

core/src/main/resources/hudson/model/ComputerSet/index.jelly

@@ -56,8 +56,8 @@ THE SOFTWARE.
 
     <j:set var="monitors" value="${it._monitors}"/>
     <j:set var="tableWidth" value="${3}"/>
-
-    <table id="computers" class="jenkins-table sortable">
+    <t:setIconSize/>
+    <table id="computers" class="jenkins-table ${iconSize == '16x16' ? 'jenkins-table--small' : iconSize == '24x24' ? 'jenkins-table--medium' : ''} sortable">
       <thead>
         <tr>
           <th class="jenkins-table__cell--tight">S</th>
@@ -123,6 +123,7 @@ THE SOFTWARE.
       </tr>
       </tbody>
     </table>
+    <t:iconSize/>
   </l:main-panel>
 </l:layout>
 </j:jelly>