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/Models/Rdbms/ServerRegistrationDto.cs

@@ -0,0 +1,32 @@
+using System;
+using Umbraco.Core.Persistence;
+using Umbraco.Core.Persistence.DatabaseAnnotations;
+
+namespace Umbraco.Core.Models.Rdbms
+{
+    [TableName("umbracoServer")]
+    [PrimaryKey("id")]
+    [ExplicitColumns]
+    internal class ServerRegistrationDto
+    {
+        [Column("id")]
+        [PrimaryKeyColumn(AutoIncrement = true)]
+        public int Id { get; set; }
+
+        [Column("address")]
+        [Length(100)]
+        public string Address { get; set; }
+
+        [Column("registeredDate")]
+        [Constraint(Default = "getdate()")]
+        public DateTime DateRegistered { get; set; }
+
+        [Column("lastNotifiedDate")]
+        [Constraint(Default = "getdate()")]
+        public DateTime LastNotified { get; set; }
+
+        [Column("isActive")]
+        [Index(IndexTypes.NonClustered)]
+        public bool IsActive { get; set; }
+    }
+}

src/Umbraco.Core/Models/ServerRegistration.cs

@@ -0,0 +1,46 @@
+using System;
+using Umbraco.Core.Models.EntityBase;
+using Umbraco.Core.Sync;
+
+namespace Umbraco.Core.Models
+{
+    internal class ServerRegistration : Entity, IServerAddress, IAggregateRoot
+    {
+        public ServerRegistration()
+        {
+            
+        }
+
+        /// <summary>
+        /// Creates an item with pre-filled properties
+        /// </summary>
+        /// <param name="id"></param>
+        /// <param name="serverAddress"></param>
+        /// <param name="createDate"></param>
+        /// <param name="updateDate"></param>
+        public ServerRegistration(int id, string serverAddress, DateTime createDate, DateTime updateDate)
+        {
+            UpdateDate = updateDate;
+            CreateDate = createDate;
+            Key = Id.ToString().EncodeAsGuid();
+            Id = id;
+            ServerAddress = serverAddress;
+        }
+
+        /// <summary>
+        /// Creates a new instance for persisting a new item
+        /// </summary>
+        /// <param name="serverAddress"></param>
+        /// <param name="createDate"></param>
+        public ServerRegistration(string serverAddress, DateTime createDate)
+        {
+            CreateDate = createDate;
+            UpdateDate = createDate;
+            Key = 0.ToString().EncodeAsGuid();
+            ServerAddress = serverAddress;
+        }
+
+        public string ServerAddress { get; set; }        
+        public bool IsActive { get; set; }
+    }
+}