docs: def list_grants(key_id, limit=None, marker=None, region=None, key=None,
                  keyid=None, profile=None):
      '''
      List grants for the specified key.
  
      CLI example::
  
          salt myminion boto_kms.list_grants 'alias/mykey'
      '''
      conn = _get_conn(region=region, key=key, keyid=keyid, profile=profile)
  
      if key_id.startswith('alias/'):
          key_id = _get_key_id(key_id)
      r = {}
      try:
          _grants = []
          next_marker = None
          while True:
              grants = conn.list_grants(
                  key_id,
                  limit=limit,
                  marker=next_marker
              )
              for grant in grants['Grants']:
                  _grants.append(grant)
              if 'NextMarker' in grants:
                  next_marker = grants['NextMarker']
              else:
                  break
          r['grants'] = _grants
      except boto.exception.BotoServerError as e:
          r['error'] = __utils__['boto.get_error'](e)
      return r