Disable sdremote by default, and improve flow control.

It was intended to disable sdremote by default when it exited
experimental mode.

This reverts commit 576943b9bf7506829de97d2194c4bee35a485436.

Change-Id: I2c1b5443e334021bd9574316167f48b1af6200e5
Reviewed-on: https://gerrit.libreoffice.org/11837
Reviewed-by: Jan Holesovsky <kendy@collabora.com>
Tested-by: Jan Holesovsky <kendy@collabora.com>
(cherry picked from commit 99023fe9bd7d8b665faed7fe9cb98b3fb8922292)
Reviewed-on: https://gerrit.libreoffice.org/11839
Reviewed-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>
Tested-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>
Reviewed-by: Andrzej Hunt <andrzej.hunt@collabora.com>