[oe] [RFC] Handling of virtual/* namespace in packages

[Marcin Juszkiewicz]

In OpenedHand we got hit by virtual/update-alternatives and packaging. 
Poky contains two providers for virtual/u-a:

1. update-alternatives-cworth
2. update-alternatives-dpkg

First one comes from IPKG source and is written in pure shell. Second one 
is in Perl so it fetch too much to be usable.

The problem comes when you build both of them (it happens on our 
autobuilder due to 'world' build) - package manager (ipkg) selects random 
one - in our case it is always 'update-alternatives-dpkg' so generated 
rootfs is too big to be usable.

Solution which came to my mind is quite simple. Our distro (Poky) already 
prefers 'u-a-cworth' as provider for 'virtual/update-alternatives'. So if 
package depends on 'virtual/update-alternatives' then let package.bbclass 
mangle its dependencies in such way that 'u-a-cworth' (preferred by 
distro) would be writen in package.

What do you think about it?

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