Update CI job irrelevant files.

Change-Id: I0f8eca534fc03a722b1fa30cc746f63fc8bd93c3

zuul.d/tobiko-devstack.yaml

@@ -104,6 +104,7 @@
       - ^doc/.*$
       - ^etc/.*$
       - ^releasenotes/.*$
+      - ^tobiko/tests/unit/.*$
 
 
 - job:
@@ -113,7 +114,8 @@
       Base Tobiko devstack job to execute functional tests.
     vars:
       tox_envlist: functional
-
+    irrelevant-files:
+      - ^tobiko/tests/scenario/.*$
 
 - job:
     name: tobiko-devstack-multinode
@@ -140,6 +142,8 @@
       Integration test that runs all tests against DevStack provided cloud
     vars:
       tox_envlist: neutron
+    irrelevant-files:
+      - ^tobiko/tests/functional/.*$
 
 
 - job: