Disable sahara scenarios from dsvm-rally

Sahara is disabled in gate-rally-dsvm-rally now.
This issue should be fixed in openstack-infra/project-config repo , but we
can speed up fix of gates and temporary disable sahara scenarios.

Change-Id: I7864c53ebed02f04bfdd3c5b66db26cb99271e6a

rally-jobs/rally.yaml

@@ -759,40 +759,6 @@
         failure_rate:
           max: 0
 
-  SaharaNodeGroupTemplates.create_and_list_node_group_templates:
-    -
-      args:
-        flavor:
-         name: "m1.small"
-      runner:
-        type: "constant"
-        times: 20
-        concurrency: 20
-      context:
-        users:
-          tenants: 1
-          users_per_tenant: 1
-      sla:
-        failure_rate:
-          max: 0
-
-  SaharaNodeGroupTemplates.create_delete_node_group_templates:
-    -
-      args:
-        flavor:
-         name: "m1.small"
-      runner:
-        type: "constant"
-        times: 20
-        concurrency: 20
-      context:
-        users:
-          tenants: 1
-          users_per_tenant: 1
-      sla:
-        failure_rate:
-          max: 0
-
   Authenticate.validate_glance:
     -
       args: