Add yum and createrepo (from Poky)

Add yum and createrepo (from Poky)

Squashed set of changes from Poky:

svn r5098 - Add yum-native and createrepo
svn r5108 - createrepo-native: Add fix for empty data fields when creating repositories
svn r5109 - yum-native: Add patch to fix install paths
svn r5110 - yum-native: Add some hacks to make yum work better in the cross build case
svn r5118 - yum-native: add depends on libxml2-native
svn r5130 - yum-native: Add NOPOST and NOTRIGGERS flags when installing packages
svn r5133 - yum-native: Add extract-postinst.awk script for use during rootfs generation
svn r5142 - createrepo-native: added dependency on Python
svn r5157 - yum: Add yum-install-recommends.py script to handle installing Recommends
svn r5379 - yum: added 3.2.18
svn r5385 - yum-metadata-parser: fixed dependencies
svn r5392 - yum: do not hardcode arm architecture - rootfs_rpm provide arch info
svn r5395 - yum: Don't apply hacks.patch, its only needed for the native version
svn r5396 - yum-native: Fix hacks.patch to handle architecture detection issues
svn r5426 - yum: fixed packaging
svn r5427 - yum: added all required Python modules to dependencies

OE changes:

yum: do not hardcode /usr
yum-native: added intltool-native to dependencies - spotted by Tom Rini