Revert "supervdsm: Add zombiereaper to supervdsm"

Introduction of zombiereaper is causing communication failures between
vdsm and supervdsm. The change register signal handler which causes
multiprocessing to fail.

There was python bug opened to fix multiprocessing issue but it was not
backported to 2.6.

This reverts commit 262550421bd169a04bc5f795c5b95ba0e903b4e.

Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1168217
Change-Id: I90a76ad689938cc36fd9adbf73bd16e9a408cbb5
Signed-off-by: pkliczewski <piotr.kliczewski@gmail.com>
Related-To: http://bugs.python.org/issue17097
Reviewed-on: http://gerrit.ovirt.org/35802
Reviewed-by: Dan Kenigsberg <danken@redhat.com>
Tested-by: Dan Kenigsberg <danken@redhat.com>