BUG/MAJOR: config: properly initialize cpu_map.thread[] up to MAX_THREADS

A mistake was introduced in 2.4-dev17 by commit 982fb5339 ("MEDIUM:
config: use platform independent type hap_cpuset for cpu-map"), it
initializes cpu_map.thread[] from 0 to MAX_PROCS-1 instead of
MAX_THREADS-1 resulting in crashes when the two differ, e.g. when
building with USE_THREAD= but still with USE_CPU_AFFINITY=1.

No backport is needed.

src/haproxy.c

@@ -1778,6 +1778,8 @@ static void init(int argc, char **argv)
 		for (i = 0; i < MAX_PROCS; ++i) {
 			ha_cpuset_zero(&cpu_map.proc[i]);
 			ha_cpuset_zero(&cpu_map.proc_t1[i]);
+		}
+		for (i = 0; i < MAX_THREADS; ++i) {
 			ha_cpuset_zero(&cpu_map.thread[i]);
 		}
 	}