Fix tests

Author: kolaente

drivers/hetznercloud/create_test.go

@@ -184,15 +184,15 @@ const respInstanceCreate = `
       "id": 1,
       "type": "system",
       "status": "available",
-      "name": "ubuntu-16.04",
-      "description": "Ubuntu 16.04",
+      "name": "ubuntu-20.04",
+      "description": "Ubuntu 20.04",
       "image_size": null,
       "disk_size": 5,
       "created": "2018-01-15T11:34:45+00:00",
       "created_from": null,
       "bound_to": null,
       "os_flavor": "ubuntu",
-      "os_version": "16.04",
+      "os_version": "20.04",
       "rapid_deploy": true
     },
     "iso": null,

drivers/hetznercloud/provider_test.go

@@ -8,7 +8,7 @@ import "testing"
 
 func TestDefaults(t *testing.T) {
 	p := New().(*provider)
-	if got, want := p.image, "ubuntu-16.04"; got != want {
+	if got, want := p.image, "ubuntu-20.04"; got != want {
 		t.Errorf("Want image %q, got %q", want, got)
 	}
 	if got, want := p.datacenter, ""; got != want {