Correct variable usage error in test_get_hypervisor_uptime
Correct variable usage error in test_get_hypervisor_uptime

In test_get_hypervisor_uptime, should use hyper['id'] instead
of hypers[0]['id'] in hypers loop.

Change-Id: I391ac2b6fa756fbcec8ae4fba14cf6ca248ecb5e

vedujoshi/tempest,cisco-openstack/tempest,openstack/tempest,vedujoshi/tempest,cisco-openstack/tempest,Juniper/tempest,masayukig/tempest,Juniper/tempest,masayukig/tempest,openstack/tempest