Revert to SMO with older SQLClient driver (#889)

* Revert "Update SMO (#875)"

This reverts commit 96593d66e3.

* Revert "Switch Tools Service to new SMO and Microsoft.Data.SqlClient driver (#865)"

This reverts commit 9d140b53f3.

* Bump SMO to 160.1910315.0-preview

src/Microsoft.SqlTools.ServiceLayer/Admin/Database/AzureSqlDbHelper.cs

@@ -14,7 +14,6 @@ namespace Microsoft.SqlTools.ServiceLayer.Admin
 {
     public static class AzureSqlDbHelper
     {
-        
         /// <summary>
         /// Registry sub key for the AzureServiceObjectives overrides
         /// </summary>

src/Microsoft.SqlTools.ServiceLayer/Admin/Database/CreateDatabaseObjects.cs

@@ -17,7 +17,7 @@ using Smo = Microsoft.SqlServer.Management.Smo;
 using Microsoft.SqlServer.Management.Sdk.Sfc;
 using Microsoft.SqlServer.Management.Diagnostics;
 using System.Globalization;
-using Microsoft.Data.SqlClient;
+using System.Data.SqlClient;
 using System.Collections.Generic;
 using AzureEdition = Microsoft.SqlTools.ServiceLayer.Admin.AzureSqlDbHelper.AzureEdition;
 using Microsoft.SqlTools.ServiceLayer.Management;

src/Microsoft.SqlTools.ServiceLayer/Admin/Database/DatabasePrototype.cs

@@ -13,7 +13,7 @@ using Microsoft.SqlServer.Management.Smo;
 using Microsoft.SqlServer.Management.Sdk.Sfc;
 using Microsoft.SqlServer.Management.Diagnostics;
 using System.Globalization;
-using Microsoft.Data.SqlClient;
+using System.Data.SqlClient;
 using System.Collections.Generic;
 using System.Diagnostics;
 using AzureEdition = Microsoft.SqlTools.ServiceLayer.Admin.AzureSqlDbHelper.AzureEdition;

src/Microsoft.SqlTools.ServiceLayer/Admin/Database/DatabasePrototypeAzure.cs

@@ -5,7 +5,7 @@
 
 using System.Collections.Generic;
 using System.ComponentModel;
-using Microsoft.Data.SqlClient;
+using System.Data.SqlClient;
 using System.Globalization;
 using System.Linq;
 using Microsoft.SqlServer.Management.Common;