LU-13943 tests: load modules for list_nids getting

LU-13943 tests: load modules for list_nids getting

If modules not loaded it does not make sence to call
  host_nids_address() -> $LCTL list_nids

Test-Parameters: trivial testlist=lnet-selftest
HPE-bug-id: LUS-9265
Signed-off-by: Elena Gryaznova <elena.gryaznova@hpe.com>
Reviewed-by: Vladimir Saveliev <c17830@cray.com>
Reviewed-by: Alexander Zarochentsev <c17826@cray.com>
Change-Id: I9eb431cd293e8b4831d433ceda752b03fd78c581
Reviewed-on: https://review.whamcloud.com/39815
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Alexander Zarochentsev <alexander.zarochentsev@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>