EX-3209 lipe: add lpcc util and service

EX-3209 lipe: add lpcc util and service

Create lpcc daemon/cli and systemd serivce to manage all
PCC devices and services. Create umount.lustre to hook the
umounting and stop PCC in advance. Remove unused lpcc_test
and lpcc_cleanup. Fix stats mistake for purge_objs. Add
--pidfile for lpcc_purge.

Change-Id: I941d07b61906e4d5ebee13dab2a8015e43ecf676
Signed-off-by: Lei Feng <flei@whamcloud.com>
Test-Parameters: trivial
Reviewed-on: https://review.whamcloud.com/44103
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: John L. Hammond <jhammond@whamcloud.com>
Reviewed-by: Li Xi <lixi@ddn.com>