utils.py: Add hostUUID retrieval support for KVM on PPC64

Change-Id: I7a557b096550631e340fcc61bcb3fa4c3ae73837
Signed-off-by: Pradipta Kr. Banerjee <bpradip@in.ibm.com>
Signed-off-by: Vitor de Lima <vitor.lima@eldorado.org.br>
Reviewed-on: http://gerrit.ovirt.org/8637
Reviewed-by: Francesco Romani <fromani@redhat.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>
Reviewed-by: Gustavo Frederico Temple Pedrosa <gustavo.pedrosa@eldorado.org.br>
Tested-by: Gustavo Frederico Temple Pedrosa <gustavo.pedrosa@eldorado.org.br>