MEDIUM: config: remove the "process" keyword on "bind" lines

It was deprecated, marked for removal in 2.7 and was already emitting a
warning, let's get rid of it. Note that we've kept the keyword detection
to suggest to use "thread" instead.
diff --git a/doc/configuration.txt b/doc/configuration.txt
index 900fd88..5988438 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -14416,26 +14416,6 @@
   (without setting this option), if a ChaCha20-Poly1305 cipher is at the top of
   the client cipher list.
 
-process <process-set>[/<thread-set>]
-  This restricts the list of threads on which this listener is allowed to run.
-  It does not enforce any of them but eliminates those which do not match. Note
-  that only process number 1 is permitted. If a thread set is specified, it
-  limits the threads allowed to process incoming connections for this listener.
-  For the unlikely case where several ranges are needed, this directive may be
-  repeated. <process-set> and <thread-set> must use the format
-
-      all | odd | even | number[-[number]]
-
-  Ranges can be partially defined. The higher bound can be omitted. In such a
-  case, it is replaced by the corresponding maximum value. The main purpose is
-  to have multiple bind lines sharing the same IP:port but not the same thread
-  in a listener, so that the system can distribute the incoming connections
-  into multiple queues, bypassing haproxy's internal queue load balancing.
-  Currently Linux 3.9 and above is known for supporting this.
-
-  This directive is deprecated in favor of the more suited "thread" directive
-  below, and will be removed in 2.7.
-
 proto <name>
   Forces the multiplexer's protocol to use for the incoming connections. It
   must be compatible with the mode of the frontend (TCP or HTTP). It must also
diff --git a/src/listener.c b/src/listener.c
index 8a033fd..59c31cf 100644
--- a/src/listener.c
+++ b/src/listener.c
@@ -1734,31 +1734,8 @@
 /* parse the "process" bind keyword */
 static int bind_parse_process(char **args, int cur_arg, struct proxy *px, struct bind_conf *conf, char **err)
 {
-	char *slash;
-	unsigned long proc = 0, thread = 0;
-
-	if ((slash = strchr(args[cur_arg + 1], '/')) != NULL)
-		*slash = 0;
-
-	if (parse_process_number(args[cur_arg + 1], &proc, 1, NULL, err)) {
-		memprintf(err, "'%s' : %s", args[cur_arg], *err);
-		return ERR_ALERT | ERR_FATAL;
-	}
-
-	if (slash) {
-		if (parse_process_number(slash+1, &thread, MAX_THREADS, NULL, err)) {
-			memprintf(err, "'%s' : %s", args[cur_arg], *err);
-			return ERR_ALERT | ERR_FATAL;
-		}
-		*slash = '/';
-	}
-
-	conf->bind_thread |= thread;
-
-	memprintf(err, "'process %s' on 'bind' lines is deprecated and will be removed in 2.7.", args[cur_arg+1]);
-	if (slash)
-		memprintf(err, "%s Please use 'thread %s' instead.", *err, slash + 1);
-	return ERR_WARN;
+	memprintf(err, "'process %s' on 'bind' lines is not supported anymore, please use 'thread' instead.", args[cur_arg+1]);
+	return ERR_ALERT | ERR_FATAL;
 }
 
 /* parse the "proto" bind keyword */