fix(all): increase global http client timeout to 35s and precise lower timeouts where needed

- Fix DNS blocklists slow downloads, fix #3102
- Leave 35s timeout for updaters
- Set timeouts to 1s for local calls
- Set timeouts to 5s for LAN VPN calls and small external calls
- Set timeouts to 10s external VPN API calls

cmd/gluetun/main.go

@@ -264,7 +264,7 @@ func _main(ctx context.Context, buildInfo models.BuildInformation,
 
 	puid, pgid := int(*allSettings.System.PUID), int(*allSettings.System.PGID)
 
-	const clientTimeout = 15 * time.Second
+	const clientTimeout = 35 * time.Second
 	httpClient := &http.Client{Timeout: clientTimeout}
 	// Create configurators
 	alpineConf := alpine.New()