Add syslog_pid sudoers option to log sudo's process ID when logging

via syslog.  This is disabled by default to match historic behavior.

plugins/sudoers/def_data.c

@@ -465,6 +465,10 @@ struct sudo_defs_types sudo_defs_table[] = {
 	"iolog_flush", T_FLAG,
 	N_("Flush I/O log data to disk immediately instead of buffering it"),
 	NULL,
+    }, {
+	"syslog_pid", T_FLAG,
+	N_("Include the process ID when logging via syslog"),
+	NULL,
     }, {
 	NULL, 0, NULL
     }