Add command to create QA users

[janette]

Need equivalent of ahoy dkan create-QA-users

  create-qa-users:
    usage: Create users for each core role for QA purposes
    cmd: |
      ahoy drush "user-create sitemanager --mail=sitemanager@example.com --password=sitemanager"
      ahoy drush "user-add-role 'site manager' --name=sitemanager"
      ahoy drush "user-create editor --mail=editor@example.com --password=editor"
      ahoy drush "user-add-role editor --name=editor"
      ahoy drush "user-create creator --mail=creator@example.com --password=creator"
      ahoy drush "user-add-role 'content creator' --name=creator"