The existing ltebox startup sequence on nepes occasionally fails.
Running

    sudo su -c 'screen -dm -S simulated_hss /opt/hss_sim0609/starthss' \
        && sleep 1 && sudo /opt/ltebox/tools/start_mme && sudo /opt/ltebox/tools/start_xGw \
        & sleep 1 && ip a show dev tun1

Reliably shows that no tun1 interface is created, because that takes
around 1s itself. Increasing the second sleep to 2 reliably deploys it
correctly.

Do the same for sabox and ltebox on nano for consistency.
Signed-off-by: Robert Schmidt <robert.schmidt@openairinterface.org>