tests: use python to untar as tar of rhel-5.5 does not detect end-of-tar correctly
tests: use python to untar as tar of rhel-5.5 does not detect end-of-tar correctly

Change-Id: If4fc3d870d9d9a6b3fa72258374335675cc178c2
Signed-off-by: Alon Bar-Lev <2e3ceb4d37adc6ae3ccc00d3646e0e0a036ace03@redhat.com>

oVirt/ovirt-host-deploy,alonbl/ovirt-host-deploy,alonbl/ovirt-host-deploy,oVirt/ovirt-host-deploy,oVirt/ovirt-host-deploy