EX-8590 lipe: Use only one client for the test

EX-8590 lipe: Use only one client for the test

Use only one client machine for hot-pools tests 75a, b, c.

Test-Parameters: trivial testlist=hot-pools
Test-Parameters: trivial testlist=hot-pools env=ONLY=75a
Test-Parameters: trivial testlist=hot-pools env=ONLY=75b
Test-Parameters: trivial testlist=hot-pools env=ONLY=75c
Test-Parameters: trivial testlist=hot-pools env=ONLY=75a
Test-Parameters: trivial testlist=hot-pools env=ONLY=75b
Test-Parameters: trivial testlist=hot-pools env=ONLY=75c
Signed-off-by: Alexandre Ioffe <aioffe@ddn.com>
Change-Id: Icfa958474ec928faeec63029a2d5983cea650bb7
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/53240
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Vitaliy Kuznetsov <vkuznetsov@ddn.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>