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/11838
Reviewed-by: Jan Holesovsky <kendy@collabora.com>
Tested-by: Jan Holesovsky <kendy@collabora.com>