CLOUDSTACK-2844: VPC UI: Disable LB links if not supported on tier

ui/modules/vpc/vpc.css

@@ -154,6 +154,15 @@
   cursor: pointer;
 }
 
+.vpc-network-chart .tier-item .content .dashboard-item.disabled {
+  /*+opacity:50%;*/
+  filter: alpha(opacity=50);
+  -ms-filter: progid:DXImageTransform.Microsoft.Alpha(Opacity=50);
+  -moz-opacity: 0.5;
+  opacity: 0.5;
+  cursor: not-allowed;
+}
+
 .vpc-network-chart .tier-item .content .dashboard-item:hover {
   background-color: #DBEDFE;
   /*+box-shadow:inset 0px 1px 2px #000000;*/
@@ -271,6 +280,8 @@
   float: left;
   /*+placement:shift 10px 176px;*/
   position: relative;
+  left: 10px;
+  top: 176px;
   left: 0px;
   top: 237px;
 }

ui/modules/vpc/vpc.js

@@ -231,7 +231,15 @@
         $dashboardItem.append($total, $name);
         $dashboardItem.appendTo($dashboard);
 
+        if (dashboardItem._disabled) {
+          $dashboardItem.addClass('disabled');
+        }
+
         $dashboardItem.click(function() {
+          if ($dashboardItem.is('.disabled')) {
+            return false;
+          }
+          
           var section = cloudStack.vpc.sections[id];
           var $section = $('<div>');
           var $loading = $('<div>').addClass('loading-overlay');

ui/scripts/vpc.js

@@ -3482,17 +3482,41 @@
                   }
                 ).length ? tier._highlighted = true : tier._highlighted = false;
 
+                // Get LB capabilities
+                var lbSchemes = $.grep(
+                  $.grep(
+                    tier.service,
+                    function(service) {
+                      return service.name == 'Lb';
+                    }
+                  )[0].capability,
+                  function(capability) {
+                    return capability.name == 'LbSchemes';
+                  }
+                );
+
+                var hasLbScheme = function(schemeVal) {
+                  return $.grep(
+                    lbSchemes,
+                    function(scheme) {
+                      return scheme.value == schemeVal;
+                    }
+                  ).length ? true : false;
+                };
+
                 return $.extend(tier, {
                   _dashboardItems: [
                     {
                       id: 'internalLoadBalancers',
                       name: 'Internal LB',
-                      total: internalLoadBalancers.count
+                      total: internalLoadBalancers.count,
+                      _disabled: !hasLbScheme('Internal')
                     },
                     {
                       id: 'publicLbIps',
                       name: 'Public LB IP',
-                      total: publicLbIps.count
+                      total: publicLbIps.count,
+                      _disabled: !hasLbScheme('Public')
                     },
                     {
                       id: 'tierStaticNATs',