Revert "Bfq patch3"

This reverts commit 7a71ebe8dd5781608fa3058f27eb92433bf1d55e.
Revert "Bfq patch2"

This reverts commit dd1aa50f282b6b13d1b5d994f761897333101139.
Revert "Bfq patch1"

This reverts commit 3a6a98efff892bca3cda89ad311f04890691a194.
Cfq io scheduler as default