ORNL-14: Configuration and Unit test cases

ORNL-14: Configuration and Unit test cases

In this patch, some procfs and test cases are added for imperative recovery.

Signed-off-by: Jinshan Xiong <jay@whamcloud.com>
Change-Id: Ied49b622208157a74e8547e4609d61ee5041f624
Reviewed-on: http://review.whamcloud.com/1219
Tested-by: Hudson
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Yu Jian <yujian@whamcloud.com>