[TODO] OCHD2.1 support for TLV 39

[AdrianSimionov]

It is defined in OC-SP-HOST2.1-CFR-I17

TLV Number	Name	Chapter
39	HomeNetworkPrefixValidation	15.2.9
39.1	InstanceNumber	15.2.9.1
39.2	PrefixUsage	15.2.9.2
39.3	IPAddressVersion	15.2.9.3
39.4	IPv4PrefixLength	15.2.9.4
39.5	IPv4SubnetAddress	15.2.9.5
39.6	IPV6PrefixLength	15.2.9.6
39.7	IPv6NetworkAddress	15.2.9.7

A test case should also be written.