BUG/MINOR: quic: Missing detections of amplification limit reached

Mark the connection as limited by the anti-amplification limit when trying to
probe the peer.
Wakeup the connection PTO/dectection loss timer as soon as a datagram is
received. This was done only when the datagram was dropped.
This fixes deadlock issues revealed by some interop runner tests.

Must be backported to 2.7 and 2.6.
1 file changed