LU-1290 quota: transfer quota in osd_attr_set()

LU-1290 quota: transfer quota in osd_attr_set()

Move the ll_vfs_dquot_transfer() out of the osd_inode_setattr(),
since ll_vfs_dquot_transfer() will hold the dqptr_sem, whereas
the osd_inode_setattr() is protected by spin lock oo_guard.

Signed-off-by: Niu Yawei <niu@whamcloud.com>
Change-Id: Ib36231fb30eabfd39fe0baf16e982357113c6121
Reviewed-on: http://review.whamcloud.com/2463
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Johann Lombardi <johann@whamcloud.com>
Reviewed-by: Fan Yong <yong.fan@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>