User creation handler clean-ups (#1867)

* Wire up init user message

* Send schema list

* Load database roles

* Add create user

* Add a delete user handler and format service file

src/Microsoft.SqlTools.ServiceLayer/Security/UserData.cs

@@ -114,7 +114,7 @@ namespace Microsoft.SqlTools.ServiceLayer.Security
             }
             else
             {
-                this.name = userInfo.UserName;
+                this.name = userInfo.Name;
                 this.mappedLoginName = userInfo.LoginName;
                 this.defaultSchemaName = userInfo.DefaultSchema;
                 this.password = DatabaseUtils.GetReadOnlySecureString(userInfo.Password);