Add support for the following RFCs:

Add support for the following RFCs:
	DHCP SLP Directory Agent, RFC2610
	DHCP Name Service Search, RFC2937
	DHCP PANA Authentication Agent, RFC5192
	DHCP Lost Server, RFC5223
	DHCP CAPWAP, RFC5417
	DHCP Mobility Services, RFC5678
	DHCP SIP UA, RFC6011
	DHCP ANDSF, RFC6153
	DHCP RDNSS Selection for MIF Nodes, RFC6731
	DHCP TFTP Server Address, RFC5859
	DHCP PXELINUX, RFC5071
	DHCP Access Network Domain Name, RFC5986
	DHCP Virtual Subnet Selection, RFC6607
	DHCP Relay Agent Remote-ID, RFC4649
	DHCP Relay Agent Subscriber-ID, RFC4580
	DHCPv6 Relay-ID, RFC5460
	DHCPv6 LIS Discovery, RFC5986
	DHCPv6 SIP UA, RFC6011
	DHCPv6 Network Boot, RFC5970
	DHCPv6 Home Info Discovery in MIPv6, RFC6610
	DHCPv6 RDNSS Selection for MIF Nodes, RFC6731
	DHCPv6 Kerberos, RFC6784
	DHCPv6 Relay-Triggered Reconfiguraion, RFC6977
	DHCPv6 SOL_MAX_RT, RFC7083