cloud_discovery: Add 'sync' after file generation in Cloud discovery process

Fixes: WIFI-14906
Signed-off-by: Tanya Singh <tanya_singh@accton.com>

feeds/tip/certificates/files/etc/init.d/early_boot

@@ -20,6 +20,7 @@ copy_certificates() {
 	[ -z "$country" ] && country=US
 	echo "options cfg80211 ieee80211_regdom="$country > /etc/modules.conf 
 	echo -n $country > /etc/ucentral/country
+	sync
 	exit 0
 }
 

feeds/tip/cloud_discovery/files/usr/bin/cloud_discovery

@@ -91,6 +91,7 @@ function gateway_write(data) {
 	}
 	if (changed)
 		fs.writefile('/etc/ucentral/gateway.json', new);
+		system('sync');
 	return changed;
 }