infra: Add logging in case PoolHandler crashes

This helps for debugging cases where the helper crashes because of bugs
rather than an IO error

We only do it if the process closes in a timely fashion as it might be
in D state for a long time.

Change-Id: Ie488886a608a6855019d4c36eb2b31c9a941f8c8
Signed-off-by: Saggi Mizrahi <smizrahi@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/14626
Reviewed-by: Yaniv Bronhaim <ybronhei@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>