Importing from ember-qunit should not add qunit imports unless needed

[Robert Jackson]

Given:

import resolver from './helpers/resolver';
import {
  setResolver
} from 'ember-qunit';
import { start } from 'ember-cli-qunit';

setResolver(resolver);
start();

We are currently emitting:

import resolver from './helpers/resolver';
import { module } from 'qunit';
import {
  setResolver
} from 'ember-qunit';
import { start } from 'ember-cli-qunit';

setResolver(resolver);
start();

The import { module } from 'qunit'; should not have been added in this context.