LU-5779 test: wait for CT registration in sanity-hsm test_70

LU-5779 test: wait for CT registration in sanity-hsm test_70

In sanity-hsm test_70 wait for the copytool to register before
shutting it down (via SIGINT) so that the desired events may be
emitted.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: Ibc3fa26c119cebd10566b9ac3b4d1a754da1aaf2
Reviewed-on: http://review.whamcloud.com/12367
Reviewed-by: James Nunez <james.a.nunez@intel.com>
Tested-by: Jenkins
Reviewed-by: frank zago <fzago@cray.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>