sosreport: Don't try to collect info from sockets

sosreport gets an IOError trying to collect data
from svdsm.sock:
'caught IO error copying /var/run/vdsm/svdsm.sock'

Change-Id: I2aa8df2a8d16c7a3468cd7cad21fe598b33b8500
Signed-off-by: Yeela Kaplan <ykaplan@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/35513
Reviewed-by: Dan Kenigsberg <danken@redhat.com>