Add WPA_IGNORE_CONFIG_ERRORS option to continue in case of bad config

This is an option to continue with wpa_supplicant and hostapd even if
config file has errors. The problem is that these daemons are the best
"candidates" for the config change, so if they can not start because
config file was let's say corrupted, you can not fix it easily.

Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>

hostapd/config_file.c

@@ -2071,12 +2071,14 @@ struct hostapd_config * hostapd_config_read(const char *fname)
 	if (hostapd_config_check(conf))
 		errors++;
 
+#ifndef WPA_IGNORE_CONFIG_ERRORS
 	if (errors) {
 		wpa_printf(MSG_ERROR, "%d errors found in configuration file "
 			   "'%s'", errors, fname);
 		hostapd_config_free(conf);
 		conf = NULL;
 	}
+#endif /* WPA_IGNORE_CONFIG_ERRORS */
 
 	return conf;
 }

wpa_supplicant/config_file.c

@@ -331,11 +331,13 @@ struct wpa_config * wpa_config_read(const char *name)
 	config->ssid = head;
 	wpa_config_debug_dump_networks(config);
 
+#ifndef WPA_IGNORE_CONFIG_ERRORS
 	if (errors) {
 		wpa_config_free(config);
 		config = NULL;
 		head = NULL;
 	}
+#endif /* WPA_IGNORE_CONFIG_ERRORS */
 
 	return config;
 }