for the default symbolname prefix ("vmod_")

This should help the transition for VMOD writers that rely on the
SHA256_* functions.

Fixes #2468

Sort various lists

This reverts commit 83425a05.

This is similar to `varnishd -x optstring`.

Refs dc5fe3b

This helps write scripts like this:

    optstring=$(varnishd -x optstring)

    while getopts $optstring opt
    do
        case $opt in
        n)
            # handle $OPTARG
            ;;
        # handle other options
        *)
            # ignore unneeded options
            ;;
        esac
    done

    varnishd "$@"

Otherwise if optstring is not kept in sync, getopts will stop processing
options if it encounters one that is not specified.