EX-4866 lipe: don't unmount the local client

EX-4866 lipe: don't unmount the local client

Exclude local client from unmount list when test is
completed in hot-pools test framework.

Test-Parameters: trivial testlist=hot-pools
Signed-off-by: Alexandre Ioffe <aioffe@ddn.com>
Change-Id: I6b12269b6af3d3b5465645cbc007c9a5302f64a1
Reviewed-on: https://review.whamcloud.com/46671
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Jian Yu <yujian@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: John L. Hammond <jhammond@whamcloud.com>