Add a dry run mode to test-network.sh

    --coverage)

      export USE_COVERAGE_BINARY=true

      ;;

    --dry-run)

      # process arguments, but don't call any other scripts

      export NETWORK_DRY_RUN=true

      ;;

    *)

      echo "$myname: Sorry, I don't know what to do with '$1'."

      echo "$myname: Maybe chutney's test-network.sh understands '$1'."

      echo "$myname: Please update your chutney using 'git pull', and set \

\$CHUTNEY_PATH"

      # continue processing arguments during a dry run

      if [ "$NETWORK_DRY_RUN" != true ]; then

          exit 2

      fi

    ;;

  esac

  shift

export NETWORK_FLAVOUR=${NETWORK_FLAVOUR:-"bridges+hs"}

export CHUTNEY_NETWORK=networks/$NETWORK_FLAVOUR

# And finish up if we're doing a dry run

if [ "$NETWORK_DRY_RUN" = true]; then

    exit 0

fi

cd "$CHUTNEY_PATH"

./tools/bootstrap-network.sh $NETWORK_FLAVOUR || exit 2