BUG/MEDIUM: quic: Possible use of uninitialized <odcid> variable in qc_lstnr_params_i...

BUG/MEDIUM: quic: Possible use of uninitialized <odcid> variable in qc_lstnr_params_init()

When receiving a token into a client Initial packet without a cluster secret defined
by configuration, the <odcid> variable used to parse the ODCID from the token
could be used without having been initialized. Such a packet must be dropped. So
the sufficient part of this patch is this check:

+             }
+             else if (!global.cluster_secret && token_len) {
+                    /* Impossible case: a token was received without configured
+                    * cluster secret.
+                    */
+                    TRACE_PROTO("Packet dropped", QUIC_EV_CONN_LPKT,
+                    NULL, NULL, NULL, qv);
+                    goto drop;
              }

Take the opportunity of this patch to rework and make it more readable this part
of code where such a packet must be dropped removing the <check_token> variable.
When an ODCID is parsed from a token, new <token_odcid> new pointer variable
is set to the address of the parsed ODCID. This way, is not set but used it will
make crash haproxy. This was not always the case with an uninitialized local
variable.

Adapt the API to used such a pointer variable: <token> boolean variable is removed
from qc_lstnr_params_init() prototype.

This must be backported to 2.6.