LU-169 clio: restart clio operations if layout changes

LU-169 clio: restart clio operations if layout changes

For glimpse and setattr operations, the layout may change as they may
not open file while running, so we need to restart these operations
in case layout is changed during the IO time.

Signed-off-by: Jinshan Xiong <jinshan.xiong@whamcloud.com>
Change-Id: Ia7ba1829164259e06af342be3f94e654ed0f89b8
Reviewed-on: http://review.whamcloud.com/2026
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Fan Yong <yong.fan@whamcloud.com>
Reviewed-by: Johann Lombardi <johann@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>