Refactor stack command/package

- Handle `bundlefile` directly in the `top-level`
  command. `bundlefile` is still experimental and will be deprecated
  in future version — this should make be easier to remove it.
- Validate the `stack` name in all cases (i.e. whatever the
  orchestrator is used)
- Load the composefile ahead of choosing the orchestrator. This
  removes some slight duplication.
- Makes `RunDeploy` easier to use from outside packages (like
  `docker/app`) with a preloaded configuration.

Signed-off-by: Vincent Demeester <vincent@sbr.pm>

cli/command/stack/remove_test.go

@@ -41,6 +41,14 @@ func fakeClientForRemoveStackTest(version string) *fakeClient {
 	}
 }
 
+func TestRemoveWithEmptyName(t *testing.T) {
+	cmd := newRemoveCommand(test.NewFakeCli(&fakeClient{}), &orchestrator)
+	cmd.SetArgs([]string{"good", "'   '", "alsogood"})
+	cmd.SetOutput(ioutil.Discard)
+
+	assert.ErrorContains(t, cmd.Execute(), `invalid stack name: "'   '"`)
+}
+
 func TestRemoveStackVersion124DoesNotRemoveConfigsOrSecrets(t *testing.T) {
 	client := fakeClientForRemoveStackTest("1.24")
 	cmd := newRemoveCommand(test.NewFakeCli(client), &orchestrator)