EX-8130 lipe: Directory scan size stats

EX-8130 lipe: Directory scan size stats

This patch adds functionality for creating new
directories and expanding memory for new child
directories in memory. Adds a function to
initialize the starting directory.

Test-Parameters: trivial
Signed-off-by: Vitaliy Kuznetsov <vkuznetsov@ddn.com>
Change-Id: I3ff6a62ffd9d6535ed4434f517d1c93d6ae01b34
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/53960
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>