[Yum-devel] Two more plugin slots

[Panu Matilainen]

The attached patch adds what I think are the two most crucial missing
pieces in the current plugin infrastructure: preresolve and postresolve
slots. 

Preresolve is needed for plugins which want to add/remove some packages
to the transaction (and have their dependencies resolved) based perhaps
on what else was in the transaction (feel free to come up with your own
crack ideas :)

Postresolve is needed for taking custom action based on the dependency
resolution process, a practical example would be the "don't let me eat
myself" plugin discussed on yum-users list a few days ago.

Any big objections? Oh, one issue with the current patch: it would be
nice to let the postresolve slot know the result code + string of
resolveDeps() run. I'll check how to go about that + commit if nobody
screams death to the apt-head to the general idea of these slots :)

	- Panu -

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