updater: refactoring and set DNS server correctly

- Fix CLI operation not setting DNS server
- Fix periodic operation not setting DNS server
- Set DNS address for resolution once at start for both CLI and periodic operation
- Inject resolver to each provider instead of creating it within
- Use resolver settings on every call to `.Resolve` method, instead of passing it to constructor
- Move out minServers check from resolver

internal/provider/cyberghost/provider.go

@@ -16,12 +16,13 @@ type Provider struct {
 	common.Fetcher
 }
 
-func New(storage common.Storage, randSource rand.Source) *Provider {
+func New(storage common.Storage, randSource rand.Source,
+	parallelResolver common.ParallelResolver) *Provider {
 	return &Provider{
 		storage:         storage,
 		randSource:      randSource,
 		NoPortForwarder: utils.NewNoPortForwarding(providers.Cyberghost),
-		Fetcher:         updater.New(),
+		Fetcher:         updater.New(parallelResolver),
 	}
 }