rulecache: sort rules additionally by id

rulecache: sort rules additionally by id

When more rules have the same priority currently their order is not
stable - postgres returns them in a stable way, based on their last
changetime - e.g. disabling and reenabling a rule puts it in the front
of evaluation. Sortin by id (the primary key) in addition should make
rule evaluation robust to such updates

While there is no guarantee of ordering (within the same priority)
unexpected changes in which rule fires can cause confusion (at least
it confused me quite a bit).

Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>