change JobTask to SiteTask

Oqtane.Server/Infrastructure/SiteTasks/SiteTaskBase.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Threading.Tasks;
+using Oqtane.Models;
+
+namespace Oqtane.Infrastructure
+{
+    public class SiteTaskBase : ISiteTask
+    {
+        public virtual string ExecuteTask(IServiceProvider provider, Site site, string parameters)
+        {
+            return "";
+        }
+
+        public virtual Task<string> ExecuteTaskAsync(IServiceProvider provider, Site site, string parameters)
+        {
+            return Task.FromResult(string.Empty);
+        }
+    }
+}