chore(updater): common GetServers signature

- Log warnings when running outside of CLI mode
- Remove updater CLI bool setting
- Warnings are logged in updating functions

internal/provider/perfectprivacy/updater/updater.go

@@ -0,0 +1,19 @@
+package perfectprivacy
+
+import "github.com/qdm12/gluetun/internal/updater/unzip"
+
+type Updater struct {
+	unzipper unzip.Unzipper
+	warner   Warner
+}
+
+type Warner interface {
+	Warn(s string)
+}
+
+func New(unzipper unzip.Unzipper, warner Warner) *Updater {
+	return &Updater{
+		unzipper: unzipper,
+		warner:   warner,
+	}
+}