hostname: Add an option for extra tests
hostname: Add an option for extra tests

Add an extra tests option in 'getHostname' function

Bug-Url: https://bugzilla.redhat.com/1616158
Signed-off-by: Asaf Rachmani <cf92fa3c4cb4b8f0f0e8907fa43b1321425f3c89@redhat.com>
Change-Id: I5db483ef4bb0ae2f707efcfbac1fbeb0723acb1e

oVirt/ovirt-setup-lib,oVirt/ovirt-setup-lib,oVirt/ovirt-setup-lib,oVirt/ovirt-setup-lib