wpa_supplicant: Support 'relog' command to re-open log files

This allows rolling log files:

mv log.txt log.txt.1
wpa_cli relog

Signed-off-by: Ben Greear <greearb@candelatech.com>

src/utils/wpa_debug.h

@@ -40,6 +40,7 @@ enum {
 #else /* CONFIG_NO_STDOUT_DEBUG */
 
 int wpa_debug_open_file(const char *path);
+int wpa_debug_reopen_file(void);
 void wpa_debug_close_file(void);
 
 /**