Debugging tests for AuthInfo (#1046)

* debug

* fix

credentials/credentials_test.go

@@ -155,6 +155,7 @@ func serverHandle(t *testing.T, hs serverHandshake, done chan AuthInfo, lis net.
 	serverAuthInfo, err := hs(serverRawConn)
 	if err != nil {
 		t.Errorf("Server failed while handshake. Error: %v", err)
+		serverRawConn.Close()
 		close(done)
 		return
 	}