Do not call another testcase in one testcase
Do not call another testcase in one testcase

test_rebuild_server_with_volume_attached called
test_rebuild_server, and this will cause confusing log
which will display "Request-Url (ServerActionsTestJSON:
test_rebuild_server):" when we run test_rebuild_server_
with_volume_attached. This is to avoid this.

Change-Id: Ief80feacecc3f2c382e62ebbdcd7ba629926bc42

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