Adds new database table + migration + unit test + fixes up unit tests to ensure PluginManager.Current = null; is done on teardown.

Created new ServerRegistrationRepository + unit tests + models

src/Umbraco.Core/Sync/ConfigServerAddress.cs

@@ -0,0 +1,29 @@
+using System.Xml;
+using Umbraco.Core.Configuration;
+using Umbraco.Core.IO;
+
+namespace Umbraco.Core.Sync
+{
+    /// <summary>
+    /// A server registration based on the legacy umbraco xml configuration in umbracoSettings
+    /// </summary>
+    internal class ConfigServerAddress : IServerAddress
+    {
+
+        public ConfigServerAddress(XmlNode n)
+        {
+            var webServicesUrl = IOHelper.ResolveUrl(SystemDirectories.WebServices);
+
+            var protocol = GlobalSettings.UseSSL ? "https" : "http";
+            if (n.Attributes.GetNamedItem("forceProtocol") != null && !string.IsNullOrEmpty(n.Attributes.GetNamedItem("forceProtocol").Value))
+                protocol = n.Attributes.GetNamedItem("forceProtocol").Value;
+            var domain = XmlHelper.GetNodeValue(n);
+            if (n.Attributes.GetNamedItem("forcePortnumber") != null && !string.IsNullOrEmpty(n.Attributes.GetNamedItem("forcePortnumber").Value))
+                domain += string.Format(":{0}", n.Attributes.GetNamedItem("forcePortnumber").Value);
+            ServerAddress = string.Format("{0}://{1}{2}/cacheRefresher.asmx", protocol, domain, webServicesUrl);
+        }
+
+        public string ServerAddress { get; private set; }
+        
+    }
+}