Add missing test specs

test/case/dhcp/client6_basic/test.adoc

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+=== DHCPv6 Basic
+
+ifdef::topdoc[:imagesdir: {topdoc}../../test/case/infix_dhcp/client6_basic]
+
+==== Description
+
+Enable a DHCPv6 client and verify it requests an IPv6 lease from a
+DHCPv6 server that is then set on the interface.
+
+==== Topology
+
+image::topology.svg[DHCPv6 Basic topology, align=center, scaledwidth=75%]
+
+==== Sequence
+
+. Set up topology and attach to target DUT
+. Configure DHCPv6 client
+. Verify client lease for {CLIENT}
+. Verify client default route ::/0
+. Verify client domain name resolution
+
+

test/case/dhcp/client6_prefix_delegation/test.adoc

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+=== DHCPv6 Prefix Delegation
+
+ifdef::topdoc[:imagesdir: {topdoc}../../test/case/infix_dhcp/client6_prefix_delegation]
+
+==== Description
+
+Verify DHCPv6 prefix delegation (IA_PD) where a client requests an IPv6
+prefix from a DHCPv6 server.  This is commonly used on WAN interfaces of
+routers to obtain a prefix for distribution to downstream networks.
+
+==== Topology
+
+image::topology.svg[DHCPv6 Prefix Delegation topology, align=center, scaledwidth=75%]
+
+==== Sequence
+
+. Set up topology and attach to target DUT
+. Configure DHCPv6 client w/ prefix delegation
+. Verify DHCPv6 client is running
+. Verify prefix delegation in logs
+
+