The value of the object tmnxDhcpSvrSubnetMaxDeclined specifies
the maximum number of declined IP addresses that are stored.
These declined IP addresses are removed from the
tmnxDhcpSvrFreeAddrTable, and are not handed out to the clients.
When this maximum is reached, and the server receives another
DHCP DECLINE message from a client, then the oldest declined IP
address becomes again available for the clients.
When the value of this object is set to 0, no declined IP addresses
are removed from the tmnxDhcpSvrFreeAddrTable.