patch: policy update by id

[Jamal Hadi Salim <hadi@xxxxxxxx>]

Herbert,

I think this is a reasonable thing to have. I should be able to update
(just like delete or get) a policy by id. And that it trumps a selector
when both are specified..
I am assuming ids are unique - otherwise we have a serious problem.
If this patch looks good, please add it to your patch collection that
you are queueing for Dave; btw - is that stuff supposed to show up
around .13?

cheers,
jamal

polid_p
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