EX-3002 lipe: use static in lpurge

EX-3002 lipe: use static in lpurge

In lpurge, declare functions and variables static when
possible. Remove any unused functions or variables.

Signed-off-by: John L. Hammond <jhammond@whamcloud.com>
Test-Parameters: trivial testlist=hot-pools
Change-Id: I902894741c62136eda34327204f9299cd23c9e27
Reviewed-on: https://review.whamcloud.com/45385
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Alexandre Ioffe <aioffe@ddn.com>
Reviewed-by: Jian Yu <yujian@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/46123