Returns true if IAM user initialization has completed.

def __IsInitialized(self):      
    """ Returns true if IAM user initialization has completed. """  
    is_initialized = False
    iam_id = self.GetAccessKeyId()
    if iam_id:
      if core.CirrusAccessIdMetadata(self.s3, iam_id).IsInitialized():
        is_initialized = True
    return is_initialized