PEP 8: fix ignored errors E12{6,7,8}

Change-Id: Ia857d54f0634f71af15b5198a613f9113f85a7a3
Signed-off-by: Zhou Zheng Sheng <zhshzhou@linux.vnet.ibm.com>
Reviewed-on: http://gerrit.ovirt.org/10674
Reviewed-by: Dan Kenigsberg <danken@redhat.com>