Merge "ASessionDescription: allow open-ended NTP range." into lmp-dev

    s = end + 1;  // skip the dash.

    if (*s == '\0') {

        *npt2 = FLT_MAX;  // open ended.

        return true;

    }

    if (!strncmp("now", s, 3)) {

        return false;  // no absolute end time available

    }