Set TokenParent in the Index to be cached

[tvoran]

It seems like TokenParent should be set on the index about to be stored, instead of the entry that was looked up, so that when a token is revoked, it's possible to lookup all the child tokens when the parent is revoked:

vault/command/agent/cache/lease_cache.go

Lines 768 to 781 in 464f213

	// Clear the parent references of the revoked token in the entries
	// belonging to the child tokens of the revoked token.
	indexes, err = c.db.GetByPrefix(cachememdb.IndexNameTokenParent, token)
	if err != nil {
	return false, err
	}
	for _, index := range indexes {
	index.TokenParent = ""
	err = c.db.Set(index)
	if err != nil {
	c.logger.Error("failed to persist index", "error", err)
	return false, err
	}
	}

[calvn]

Nice find!