New test common project for database connections using the settings.json (#210)

* moved test driver tests and test common classes to separate projects

test/Microsoft.SqlTools.ServiceLayer.Test.Common/TestServerIdentity.cs

@@ -0,0 +1,32 @@
+//
+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+//
+
+
+namespace Microsoft.SqlTools.ServiceLayer.Test.Common
+{
+    /// <summary>
+    /// The model to deserialize the server names json
+    /// </summary>
+    public class TestServerIdentity
+    {
+        public string ServerName { get; set; }
+        public string ProfileName { get; set; }
+
+        public TestServerType ServerType { get; set; }
+    }
+
+    public enum TestServerType
+    {
+        None,
+        Azure,
+        OnPrem
+    }
+
+    public enum AuthenticationType
+    {
+        Integrated,
+        SqlLogin
+    }
+}