Merge remote-tracking branch 'origin/fix-ltebox-startup-fail' into integration_2026_w15 (!4037)

Increase reliability of ltebox start

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.

ci-scripts/ci_infra.yaml

@@ -143,7 +143,7 @@ ltebox-nano:
     - "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"
+    - "sleep 2"
   Undeploy: "sudo /opt/ltebox/tools/stop_xGw; sudo /opt/ltebox/tools/stop_mme; sudo killall screen"
   LogCollect: "cp /opt/hss_sim0609/hss.log /opt/ltebox/var/log/{mmeLog.0,s1apcLog.0,s1apsLog.0,s11cLog.0,libLog.0,xGwLog.0} %%log_dir%%"
 
@@ -154,7 +154,7 @@ sabox-nepes:
     - "sudo su -c 'screen -dm -S simulated_5g_hss /opt/hss_sim0609/start_5g_hss'"
     - "sleep 1"
     - "sudo /opt/ltebox/tools/start_sabox < /dev/null &> /dev/null"
-    - "sleep 1"
+    - "sleep 2"
   LogCollect: "cp /opt/hss_sim0609/hss.log /opt/ltebox/var/log/{amfLog.0,ngapcLog.0,ngapcommonLog.0,ngapsLog.0,xGwLog.0,upfLog.0} %%log_dir%%"
   Undeploy: "sudo /opt/ltebox/tools/stop_sabox; sudo killall screen"
 
@@ -165,7 +165,7 @@ ltebox-nepes:
     - "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"
+    - "sleep 2"
   Undeploy: "sudo /opt/ltebox/tools/stop_xGw; sudo /opt/ltebox/tools/stop_mme; sudo killall screen"
   LogCollect: "cp /opt/hss_sim0609/hss.log /opt/ltebox/var/log/{mmeLog.0,s1apcLog.0,s1apsLog.0,s11cLog.0,libLog.0,xGwLog.0} %%log_dir%%"