[oe] [RFC] sane-providers.inc with default providers for all distributions

[Martin Jansa]

Hi,

so here is series of patches for compatibility-providers.conf, required from 
bitbake.conf as suggested.

Tested on 
shr-image for shr distribution (on gta02) 
xorg-image for angstrom (on spitz)

only difference was db instead of db3 providers for shr.

Tricky part is to set u-a provider in sync with opkg provider (see 6th). 
We don't want to pull 2 different opkg versions one as opkg provider 
and second as u-a, but opkg is set as provder and also IPKG_VARIANG, u-a
providers are set in sane-feed-ipk.inc/angstrom-ipkg.inc so its a bit 
error-prone, suggestions better patches are welcome.

Please test and ack.

Regards,