execCmd: no need to pass the default sudo=False value

These are remnants from the days where we had a crazier default.
Cleaned with
     sed -i 's/execCmd\(.*\), sudo=False/execCmd\1/'
and a couple of manual additions.

Change-Id: Id8c0e30756113ddb35d2e51984c3ea72bbe45a44
Signed-off-by: Dan Kenigsberg <danken@redhat.com>
Signed-off-by: Vinzenz Feenstra <vfeenstr@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/24145
Reviewed-by: Francesco Romani <fromani@redhat.com>
Reviewed-by: Nir Soffer <nsoffer@redhat.com>
Reviewed-by: Yaniv Bronhaim <ybronhei@redhat.com>