* EFI_DHCP6_DUID structure declares Duid[1], so the size
of that structure is not large enough to hold an entire
Duid. Instead, compute the correct size to allocate an
EFI_DHCP6_DUID structure.
* Dhcp6AppendOption() takes a length parameter that in
network order. Update test cases to make sure a network
order length is passed in. A value of 0x0004 was being
passed in and was then converted to 0x0400 length and
buffer overflow was detected.
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>