Remove tune-system.sh script and its use (#7278)

scripts/tune-system.sh

@@ -1,43 +0,0 @@
-# |source| this file
-#
-# Adjusts system settings for optimal validator performance
-#
-
-sysctl_write() {
-  declare name=$1
-  declare new_value=$2
-
-  # Test the existence of the sysctl before trying to set it
-  sysctl "$name" 2>/dev/null 1>/dev/null || return 0
-
-  declare current_value
-  current_value=$(sysctl -n "$name")
-  [[ $current_value != "$new_value" ]] || return 0
-
-  declare cmd="sysctl -w $name=$new_value"
-  if [[ -n $SUDO_OK ]]; then
-    cmd="sudo $cmd"
-  fi
-
-  echo "$ $cmd"
-  $cmd || true
-
-  # Some versions of sysctl exit with 0 on permission denied errors
-  current_value=$(sysctl -n "$name")
-  if [[ $current_value != "$new_value" ]]; then
-    echo "==> Failed to set $name.  Try running: \"SUDO_OK=1 source ${BASH_SOURCE[0]}\""
-  fi
-}
-
-case $(uname) in
-Linux)
-  # Reference: https://medium.com/@CameronSparr/increase-os-udp-buffers-to-improve-performance-51d167bb1360
-  sysctl_write net.core.rmem_max 134217728
-  sysctl_write net.core.rmem_default 134217728
-  sysctl_write net.core.wmem_max 134217728
-  sysctl_write net.core.wmem_default 134217728
-  ;;
-*)
-  ;;
-esac
-