MINOR: cfgparse: support the comma separator on parse_cpu_set

Allow to specify multiple cpu ids/ranges in parse_cpu_set separated by a
comma. This is optional and must be activated by a parameter.

The comma support is disabled for the parsing of the 'cpu-map' config
statement. However, it will be useful to parse files in sysfs when
inspecting the cpus topology for NUMA automatic process binding.
diff --git a/src/cfgparse-global.c b/src/cfgparse-global.c
index 694cd70..89e3b10 100644
--- a/src/cfgparse-global.c
+++ b/src/cfgparse-global.c
@@ -1070,7 +1070,7 @@
 			}
 		}
 
-		if (parse_cpu_set((const char **)args+2, &cpus, &errmsg)) {
+		if (parse_cpu_set((const char **)args+2, &cpus, 0, &errmsg)) {
 			ha_alert("parsing [%s:%d] : %s : %s\n", file, linenum, args[0], errmsg);
 			err_code |= ERR_ALERT | ERR_FATAL;
 			goto out;