Fix MismatchError in test_host_name_is_same_as_server_name
Fix MismatchError in test_host_name_is_same_as_server_name

Nova has lowercased hostnames since 2011.
Add lower() method to self.name.

Change-Id: I87f3326b8cdab0fe6392b14daa7fb89f6e971392
Closes-bug: #1618875

openstack/tempest,openstack/tempest,Tesora/tesora-tempest,masayukig/tempest,Tesora/tesora-tempest,sebrandon1/tempest,Juniper/tempest,Juniper/tempest,vedujoshi/tempest,cisco-openstack/tempest,sebrandon1/tempest,masayukig/tempest,cisco-openstack/tempest,vedujoshi/tempest