Enforce region agent limit as set in estate tools

OpenSim/Region/Framework/Scenes/Scene.cs

@@ -3856,6 +3856,14 @@ namespace OpenSim.Region.Framework.Scenes
 
             // We have to wait until the viewer contacts this region after receiving EAC.
             // That calls AddNewClient, which finally creates the ScenePresence
+            int num = m_sceneGraph.GetNumberOfScenePresences();
+
+            if (num >= RegionInfo.RegionSettings.AgentLimit)
+            {
+                if (!Permissions.IsAdministrator(cAgentData.AgentID))
+                    return false;
+            }
+
             ScenePresence childAgentUpdate = WaitGetScenePresence(cAgentData.AgentID);
             if (childAgentUpdate != null)
             {

OpenSim/Region/Framework/Scenes/SceneGraph.cs

@@ -826,6 +826,11 @@ namespace OpenSim.Region.Framework.Scenes
             return m_scenePresenceArray;
         }
 
+        public int GetNumberOfScenePresences()
+        {
+            return m_scenePresenceArray.Count;
+        }
+
         /// <summary>
         /// Request a scene presence by UUID. Fast, indexed lookup.
         /// </summary>