Restore dependencies after running scenarios IFF there are multiple s…

…cenarios.

When there is only a single scenario to run (e.g. `ember try:one`) we should not be cleaning up as
part of running the scenario itself because in that case we would immediately cleanup _anyways_. If
we forced cleanup to happen during the scenario run, then it would be impossible to have
`--skip-cleanup` work at all.

lib/tasks/try-each.js

@@ -40,6 +40,10 @@ module.exports = CoreObject.extend({
  let results = [];
  for (let scenario of scenarios) {
  results.push(await this._runCommandForThisScenario(scenario));
+
+ if (scenarios.length > 1) {
+ await this.ScenarioManager.restoreOriginalDependencies();
+ }
  }
 
  await this._optionallyCleanup(options);
@@ -97,8 +101,6 @@ module.exports = CoreObject.extend({
  runResults.result = result;
  this._writeFooter(`Result: ${result}`);
 
- await this.ScenarioManager.restoreOriginalDependencies();
-
  return runResults;
  },