MINOR: quic: Add a counter for reordered packets

MINOR: quic: Add a counter for reordered packets

A packet is considered as reordered when it is detected as lost because its packet
number is above the largest acknowledeged packet number by at least the
packet reordering threshold value.

Add ->nb_reordered_pkt new quic_loss struct member at the same location that
the number of lost packets to count such packets.

Should be backported to 2.6.

(cherry picked from commit 167e38e0e0296e899aa894d2f3db5ba2a0c68cb5)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>