EX-2579 pcc: support a flatter HSM archive format

EX-2579 pcc: support a flatter HSM archive format

Add versioning (v1 and V2) to the HSM (PCC) archive format (directory
layout):
	v1: (oid & 0xffff)/-/-/-/-/-/FID
	v2: ((oid ^ seq) & 0xffff)/FID

v1 is the original layout and the default. v2 is the new layout which
should be selected for new installs.

Signed-off-by: Qian Yingjin <qian@ddn.com>
Change-Id: If660f3cf4c02469bb23e65a44f86f0346367adf6
Reviewed-on: https://review.whamcloud.com/43493
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Feng, Lei <flei@whamcloud.com>
Reviewed-by: Li Xi <lixi@ddn.com>