Fix creation of image for rally tester
Fix creation of image for rally tester

New glance client uses property visibility instead of is-public,
which is not reflected by os_image module that's why let's
set it through property parameter.

Change-Id: I66c9f4c15b7866db57a86417b9801647bde77fa7

okolisny/InfraRed,okolisny/InfraRed,redhat-openstack/infrared,redhat-openstack/infrared,redhat-openstack/infrared,okolisny/InfraRed