log and clean up

Author: twsouthwick

src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/SSPI/NegotiateSspiContextProvider.cs

@@ -31,9 +31,6 @@ protected override bool GenerateSspiClientContext(ReadOnlySpan<byte> incomingBlo
                 return true;
             }
 
-            _negotiateAuth.Dispose();
-            _negotiateAuth = null;
-
             return false;
         }
     }

src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/SSPI/SspiContextProvider.cs

@@ -28,6 +28,8 @@ string serverSpn
 
             var options = parser.Connection.ConnectionOptions;
 
+            SqlClientEventSource.Log.StateDumpEvent("<SspiContextProvider> Initializing provider {0} with SPN={1}", GetType().FullName, serverSpn);
+
             _authParam = new SspiAuthenticationParameters(options.DataSource, serverSpn)
             {
                 DatabaseName = options.InitialCatalog,