Updater loop with period and http route (#240)

* Updater loop with period and http route
* Using DNS over TLS to update servers
* Better logging
* Remove goroutines for cyberghost updater
* Respects context for servers update (quite slow overall)
* Increase shutdown grace period to 5 seconds
* Update announcement
* Add log lines for each provider update start

internal/params/params.go

@@ -110,6 +110,8 @@ type Reader interface {
 	GetPublicIPPeriod() (period time.Duration, err error)
 
 	GetVersionInformation() (enabled bool, err error)
+
+	GetUpdaterPeriod() (period time.Duration, err error)
 }
 
 type reader struct {