ipv6: add @ipv6_prefix_delegation test
add test, checking ipv6 prefix is properly delegated with ipv6.method shared
@RunTests:ipv6_prefix_delegation_dhclient,ipv6_prefix_delegation_internal
add test, checking ipv6 prefix is properly delegated with ipv6.method shared
@RunTests:ipv6_prefix_delegation_dhclient,ipv6_prefix_delegation_internal