[Yum] show-leaves plugin

[Ville Skyttä]

Hello,

I'd like yum to tell me if after a transaction there are any new leaf packages 
installed.  New packages installed in a transaction are the obvious ones (and 
should maybe not be displayed at all but IMO that's a minor concern that can 
be taken care of if need be, perhaps with a config option), but the more 
interesting ones are new leaves after an update or update+install transaction.  
remove-with-leaves is similar but AFAIK it handles only erase transactions.

So, I came up with the attached plugin.  I don't feel too good about clearing 
cached rpmdb data in posttrans_hook but it seems necessary and the alternative 
I came up with (grabbing rpmdb data in close_hook instead of posttrans_hook 
and accessing rpmdb there through conduit._base.rpmdb) felt even worse.  Is 
there a better way?

Comments and improvements welcome.  I'd like to see this eventually included 
in yum-utils.
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