EX-6298 tests: add hot-pools test 72 into ALWAYS_EXCEPT list

EX-6298 tests: add hot-pools test 72 into ALWAYS_EXCEPT list

This patch adds hot-pools test 72 into ALWAYS_EXCEPT list before
it gets a real fix.

Test-Parameters: trivial testlist=hot-pools
Signed-off-by: Alexandre Ioffe <aioffe@ddn.com>
Change-Id: I5d73cb38d08533656c64b69f814f1d34e5e667ff
Reviewed-on: https://review.whamcloud.com/c/ex/lustre-release/+/49184
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Colin Faber <cfaber@ddn.com>
Reviewed-by: Jian Yu <yujian@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>