Merge pull request #183 from PJODSTNY/SPA8000-MacPrefix

fix : Add new MAC Prefix 70:1f:53 (SPA8000)

New Cisco SPA8000 can come with MAC address prefix 70:1f:53
Consider adding this block inside linksys.conf dhcp_update file
subclass "voip-mac-address-prefix" 70:1f:53:a0 {
if not exists vendor-class-identifier {
option tftp-server-name = config-option VOIP.tftp-server-name;
log(concat("[", binary-to-ascii(16, 8, ":", hardware), "] ", "BOOT Linksys PREFIX 70:1f:53:a0"));
}
}

Reviewed-by: Alexandre Fournier <None>