tests: Add sample NBFT table with mpath IPv4+IPv6 discovery

tests: Add sample NBFT table with mpath IPv4+IPv6 discovery

A sample table generated by latest EDK2	snapshot:
- two HFIs: static IPv4	and static IPv6
- two boot attempts defined for	each HFI (multipath)
  with the well-known discovery NQN
- second NIC link down

Result:
- the first boot attempt properly discovered
- the second boot attempt transformed in an SSNS record
  with the discovery NQN and marked as unavailable
- two Discovery	Descriptor records corresponding with
  the boot attempts and linked to corresponding SSNS records

Signed-off-by: Tomas Bzatek <tbzatek@redhat.com>