apps: remove dangling --multipath-old flag

That was not doing much.

apps/src/args.rs

@@ -58,7 +58,6 @@ pub struct CommonArgs {
     pub qpack_blocked_streams: Option<u64>,
     pub initial_cwnd_packets: u64,
     pub multipath: bool,
-    pub multipath_old: bool,
 }
 
 /// Creates a new `CommonArgs` structure using the provided [`Docopt`].
@@ -198,7 +197,6 @@ impl Args for CommonArgs {
             .unwrap();
 
         let multipath = args.get_bool("--multipath");
-        let multipath_old = args.get_bool("--multipath-old");
 
         CommonArgs {
             alpns,
@@ -224,7 +222,6 @@ impl Args for CommonArgs {
             qpack_blocked_streams,
             initial_cwnd_packets,
             multipath,
-            multipath_old,
         }
     }
 }
@@ -255,7 +252,6 @@ impl Default for CommonArgs {
             qpack_blocked_streams: None,
             initial_cwnd_packets: 10,
             multipath: false,
-            multipath_old: false,
         }
     }
 }
@@ -294,7 +290,6 @@ Options:
   --enable-active-migration   Enable active connection migration.
   --perform-migration      Perform connection migration on another source port.
   --multipath              Enable multipath support.
-  --multipath-old          Enable (old v4) multipath support.
   -A --address ADDR ...    Specify addresses to be used instead of the unspecified address. Non-routable addresses will lead to connectivity issues.
   -R --rm-addr TIMEADDR ...   Specify addresses to stop using after the provided time (format time,addr).
   -S --status TIMEADDRSTAT ...   Specify availability status to advertise to the peer after the provided time (format time,addr,available).
@@ -543,7 +538,6 @@ Options:
   --disable-pacing            Disable pacing (linux only).
   --initial-cwnd-packets PACKETS      The initial congestion window size in terms of packet count [default: 10].
   --multipath                 Enable multipath support.
-  --multipath-old             Enable (old v4) multipath support.
   -h --help                   Show this screen.
 ";
 

apps/src/client.rs

@@ -476,7 +476,7 @@ pub fn connect(
             scid_sent = true;
         }
 
-        if (conn_args.multipath || conn_args.multipath_old) &&
+        if conn_args.multipath &&
             probed_paths < addrs.len() &&
             conn.available_dcids() > 0 &&
             conn.probe_path(addrs[probed_paths], peer_addr).is_ok()