Tool to tune system parameters like PoH service priority (#7155)

* New daemon to tune system parameters like PoH service priority

* fixes for Linux

* integrate with poh_service

* fixes

* address review comments

* remove `dead_code` directive

net/remote/remote-node.sh

@@ -129,6 +129,9 @@ cat >> ~/solana/on-reboot <<EOF
   # shellcheck source=/dev/null
   SUDO_OK=1 source scripts/tune-system.sh
 
+  sudo RUST_LOG=info ~solana/.cargo/bin/solana-sys-tuner > sys-tuner.log 2>&1 &
+  echo \$! > sys-tuner.pid
+
   (
     sudo SOLANA_METRICS_CONFIG="$SOLANA_METRICS_CONFIG" scripts/oom-monitor.sh
   ) > oom-monitor.log 2>&1 &