Merge pull request #3000 from andrewsomething/do-image-id

Return DigitalOcean image ID in output.

builder/digitalocean/artifact.go

@@ -36,7 +36,7 @@ func (a *Artifact) Id() string {
 }
 
 func (a *Artifact) String() string {
-	return fmt.Sprintf("A snapshot was created: '%v' in region '%v'", a.snapshotName, a.regionName)
+	return fmt.Sprintf("A snapshot was created: '%v' (ID: %v) in region '%v'", a.snapshotName, a.snapshotId, a.regionName)
 }
 
 func (a *Artifact) State(name string) interface{} {

builder/digitalocean/artifact_test.go

@@ -25,7 +25,7 @@ func TestArtifactId(t *testing.T) {
 
 func TestArtifactString(t *testing.T) {
 	a := &Artifact{"packer-foobar", 42, "San Francisco", nil}
-	expected := "A snapshot was created: 'packer-foobar' in region 'San Francisco'"
+	expected := "A snapshot was created: 'packer-foobar' (ID: 42) in region 'San Francisco'"
 
 	if a.String() != expected {
 		t.Fatalf("artifact string should match: %v", expected)