Added Vendor Class Identifier in DHCP offers and requests. #22
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The Vendor Class Identifier is a constant string that identifies the
kind of hardware that asks the DHCP server for a IP address.
The ID is passed via the option 60 of the DHCP messages.
The ID is set to "WIZnetSE" constant.
From a DHCP server point of view, this ID is useful for giving specific
configuration for Wiznet modules : IP address from different address
pool, different gateway, longer lease, etc.
Reference documentation :
https://datatracker.ietf.org/doc/html/rfc2132#section-9.13