docs: def _find_credentials():
      '''
      Cycle through all the possible credentials and return the first one that
      works
      '''
      usernames = []
      usernames.append(__pillar__['proxy'].get('admin_username', 'root'))
      if 'fallback_admin_username' in __pillar__.get('proxy'):
          usernames.append(__pillar__['proxy'].get('fallback_admin_username'))
  
      for user in usernames:
          for pwd in __pillar__['proxy']['passwords']:
              r = salt.modules.dracr.get_chassis_name(
                  host=__pillar__['proxy']['host'],
                  admin_username=user,
                  admin_password=pwd)
              # Retcode will be present if the chassis_name call failed
              try:
                  if r.get('retcode', None) is None:
                      __opts__['proxy']['admin_username'] = user
                      __opts__['proxy']['admin_password'] = pwd
                      return (user, pwd)
              except AttributeError:
                  # Then the above was a string, and we can return the username
                  # and password
                  __opts__['proxy']['admin_username'] = user
                  __opts__['proxy']['admin_password'] = pwd
                  return (user, pwd)
  
      logger.debug('grains fx2.find_credentials found no valid credentials, using Dell default')
      return ('root', 'calvin')