Description of problem:
PPC should support Balloon device for vms,
currently it is disabled for PPC clusters.
Version-Release number of selected component (if applicable):
3.5
Steps to Reproduce:
1. try to start vm with balloon device enabled
blocking has been added by several patches.
non-comprehensive list of relevant commits:
89ca9d0a91f2d9009348bfff02e498f7d8b4d5d5
d6c4f15d872b9e33d9e9149d2444579c5d37a04c
9db18da92db931b3ba78fb699bf337ede6f38c20
423ed9db758b4aeef07f0676b6ed35660ae7ec7f
a21243dcf9ca498166664523c472fa7cdf2acf81
e046ae9a00a2b2ef2af64656274b4a6c116bdee6