LU-5622 tests: check/wait for copytool death

LU-5622 tests: check/wait for copytool death

Seems that copytool death/kill may take more time so
this condition must be handled in sanity-hsm copytool_cleanup()
function to avoid situations where copytool will then not be
restarted, but only signaled, in next copytool_setup().

Signed-off-by: Bruno Faccini <bruno.faccini@intel.com>
Change-Id: Ia72ed07f0219cf0aa2ef5b3805fb1f7faf4dab66
Reviewed-on: http://review.whamcloud.com/11922
Reviewed-by: Henri Doreau <henri.doreau@cea.fr>
Tested-by: Jenkins
Reviewed-by: Robert Read <robert.read@intel.com>
Reviewed-by: James Nunez <james.a.nunez@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>