inventory: Only display rhn data when we have a valid username
inventory: Only display rhn data when we have a valid username

Change-Id: I7fd07b1c37499c1a6303259a5241e58c087815df
Signed-off-by: Douglas Schilling Landgraf <cb5f9630225b7afa1e13760d30868c8ce876fc60@redhat.com>

oVirt/ovirt-log-collector,oVirt/ovirt-log-collector,oVirt/ovirt-log-collector