chore(all): move sub-packages to internal/provider

internal/provider/ivpn/updater/roundtrip_test.go

@@ -0,0 +1,9 @@
+package ivpn
+
+import "net/http"
+
+type roundTripFunc func(r *http.Request) (*http.Response, error)
+
+func (f roundTripFunc) RoundTrip(r *http.Request) (*http.Response, error) {
+	return f(r)
+}