Change checks for test_server test
Change checks for test_server test

Changed checks that verify update instance name
to new with non-ASCII characters in different states.

Change-Id: I5fb58e7dbbf6a6196761a6e7bc78bea13028b715

sebrandon1/tempest,cisco-openstack/tempest,Juniper/tempest,vedujoshi/tempest,Tesora/tesora-tempest,cisco-openstack/tempest,openstack/tempest,masayukig/tempest,LIS/lis-tempest,Tesora/tesora-tempest,bigswitch/tempest,zsoltdudas/lis-tempest,zsoltdudas/lis-tempest,masayukig/tempest,sebrandon1/tempest,vedujoshi/tempest,openstack/tempest,Juniper/tempest,LIS/lis-tempest,bigswitch/tempest