[IPv6] Verify proper error handling of error condition caused by packet with Multicast Destination Address - Reassembly timeout (cfr. Tahi 5.17)

[Q-Thomas]

If the first fragment of an ICMPv6 Echo Request message is received, and the destination address is a link local multicast address, IPv6 should NOT send a Time Exceeded Error Message 60 seconds after it receives this first fragment.

There are however two exceptions to this rule:

(1) the Packet Too Big Message - Section 3.2 - to allow Path MTU discovery to work for IPv6 multicast
(2) the Parameter Problem Message, Code 2 - Section 3.4 - reporting an unrecognized IPv6 option that has the Option Type highest-order two bits set to 10).