LU-10347 tests: suspend the copytool in sanity-hsm/test_252

LU-10347 tests: suspend the copytool in sanity-hsm/test_252

The copytool does not have to, and should not, process the archive
request emitted in test_252 of sanity-hsm: the test needs the request
to time out.

This patch suspends the copytool until the request times out.

Test-Parameters: trivial testlist=sanity-hsm
Signed-off-by: Quentin Bouget <quentin.bouget@cea.fr>
Change-Id: I54d114eafb85b75e7f9160806cd3298bfa186b19
Reviewed-on: https://review.whamcloud.com/30492
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Faccini Bruno <bruno.faccini@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>