LU-506 kernel: FC15 - super_operations add evict_inode method.

LU-506 kernel: FC15 - super_operations add evict_inode method.

super_operations add a new method evict_inode(), it hybird of
delete_inode() and clear_inode().

Change-Id: Ifa6de3bca16294386f33404b5a42ff749e1d0665
Signed-off-by: Yang Sheng <ys@whamcloud.com>
Reviewed-on: http://review.whamcloud.com/1844
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Tested-by: Hudson
Reviewed-by: Lai Siyao <laisiyao@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>