Update test-vars.yml for repositories

Renamed in os_rally role repo
Changed test-vars.yml to os_rally-overrides.yml
Removed test-vars.yml

Change-Id: I73c0a045496f7c36bd00748cb2096d20b5aa7b7b
Partial-Bug: #1629284

tests/test-functional-rally.yml

@@ -28,4 +28,3 @@
         {{ rally_bin }}/rally task start /var/tmp/scenario.json
   vars_files:
     - common/test-vars.yml
-    - test-vars.yml

tests/test-install-rally.yml

@@ -46,4 +46,3 @@
     - role: "os_rally"
   vars_files:
     - common/test-vars.yml
-    - test-vars.yml

tox.ini

@@ -136,6 +136,7 @@ deps =
 commands =
     {[testenv:ansible]commands}
     ansible-playbook -i {toxinidir}/tests/inventory \
+                     -e @{toxinidir}/tests/os_rally-overrides.yml \
                      {toxinidir}/tests/test.yml -vvvv
     {[testenv:func_logs]commands}