EX-6791 lipe: lamigo, lpurge are not for customer use

EX-6791 lipe: lamigo, lpurge are not for customer use

Lamigo and lpurge helps notice that they are not intended
for direct customer use

Signed-off-by: Alexandre Ioffe <aioffe@ddn.com>
Test-Parameters: trivial
Change-Id: I36ba2da080156da2d62ffa215cd7eb98b5c10adc
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/49794
Reviewed-by: Colin Faber <cfaber@ddn.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>