Integrated use of netem with testnet scripts (#6746)

automerge

net/remote/remote-node.sh

@@ -26,6 +26,7 @@ genesisOptions="${17}"
 extraNodeArgs="${18}"
 gpuMode="${19:-auto}"
 GEOLOCATION_API_KEY="${20}"
+netemConfig="${21}"
 set +x
 
 # Use a very large stake (relative to the default multinode-demo/ stake of 42)
@@ -147,6 +148,11 @@ cat >> ~/solana/on-reboot <<EOF
     echo "Expected GPU, found none!"
     export SOLANA_GPU_MISSING=1
   fi
+
+  if [[ -n "$netemConfig" ]]; then
+    scripts/netem.sh add "$netemConfig"
+    echo "$netemConfig" > netem.cfg
+  fi
 EOF
 
   case $nodeType in