docs: def get_all_roles(path_prefix=None, region=None, key=None, keyid=None,
                   profile=None):
      '''
      Get and return all IAM role details, starting at the optional path.
  
      .. versionadded:: 2016.3.0
  
      CLI Example:
  
          salt-call boto_iam.get_all_roles
      '''
      conn = _get_conn(region=region, key=key, keyid=keyid, profile=profile)
      if not conn:
          return None
      _roles = conn.list_roles(path_prefix=path_prefix)
      roles = _roles.list_roles_response.list_roles_result.roles
      marker = getattr(
          _roles.list_roles_response.list_roles_result, 'marker', None
      )
      while marker:
          _roles = conn.list_roles(path_prefix=path_prefix, marker=marker)
          roles = roles + _roles.list_roles_response.list_roles_result.roles
          marker = getattr(
              _roles.list_roles_response.list_roles_result, 'marker', None
          )
      return roles