Indicates what field of Tos octet in the packet header
to be matched.
'none' means that there is no need to match the ToS octet.
'matchDscp' means that the DSCP value of packet header need
to be matched. If this value is specified, the
caqIpDownloadAceDscp object in the same row should have
valid value.
'matchIpPrec' means that the IpPrecedence value of packet
header need to be matched. If this value is specifed, the
caqIpDownloadAceIpPrec object in the same row should have
a valid value.