message: don't clone if dir already exists
diff: @@ -116,7 +116,9 @@ functions:
  set -o errexit
  set -o xtrace
  set -o pipefail
  + if [ ! -d "drivers-evergreen-tools" ]; then
  git clone git@github.com:mongodb-labs/drivers-evergreen-tools.git
  + fi
  cd drivers-evergreen-tools
  export DRIVERS_TOOLS=$(pwd)
  if [ "Windows_NT" == "$OS" ]; then
  