Fix scenario name in rally-neutron job

Currently there is two jobs in rally group: dsvm and dsvm-neutron.
Scenario name should be different for this jobs: {name} for dsvm
and {name}-neutron for dsvm-neutron. E.g if we want to test glance
with and without neutron, we should create two scenario files in
rally-scenarios directory: glance.yaml and glance-neutron.yaml

Change-Id: Ic7451e8e6b0b06c136db0f15ab71ca51e26dd67a

modules/openstack_project/files/jenkins_job_builder/config/rally.yaml

@@ -85,7 +85,7 @@
 
     builders:
       - devstack-rally-gate:
-          scenario: '{name}'
+          scenario: '{name}-neutron'
           neutron: '1'
 
     publishers: