LU-337 Fix alloc flags in alloc_qinfo()

LU-337 Fix alloc flags in alloc_qinfo()

CFS_ALLOC_IO allows a hang when the alloc_qinfo() results
in a cache_alloc_refill, and kicks off the ldlm shrinker.
The shrinker may hang in sync_page() on the same page on
which we already hold the lock.

Change-Id: I3d9887ebc2909d38b4abb2e8d7715913c9c2cc40
Signed-off-by: Christopher J. Morrone <morrone2@llnl.gov>
Reviewed-on: http://review.whamcloud.com/582
Reviewed-by: Bobi Jam <bobijam@whamcloud.com>
Reviewed-by: Johann Lombardi <johann@whamcloud.com>
Tested-by: Hudson