nova-live-migration tests not needed for Ironic

Ironic does not support live migration, so we will skip these tests
if the only changed files are in Ironic virt driver to ensur we
don't waste resources or time trying to run unneeded tests.

Change-Id: Ieb5ac3bb93af6a950acff4d76d0276096a6a24dd

.zuul.yaml

@@ -89,7 +89,7 @@
     description: |
       Run tempest live migration tests against local qcow2 ephemeral storage
       and shared LVM/iSCSI cinder volumes.
-    irrelevant-files: &nova-base-irrelevant-files
+    irrelevant-files:
       - ^api-.*$
       - ^(test-|)requirements.txt$
       - ^.*\.rst$
@@ -100,6 +100,7 @@
       - ^nova/policies/.*$
       - ^nova/tests/.*$
       - ^nova/test.py$
+      - ^nova/virt/ironic/.*$
       - ^releasenotes/.*$
       - ^setup.cfg$
       - ^tools/.*$
@@ -128,7 +129,21 @@
       the "iptables_hybrid" securitygroup firewall driver, aka "hybrid plug".
       The external events interactions between Nova and Neutron in these
       situations has historically been fragile. This job exercises them.
-    irrelevant-files: *nova-base-irrelevant-files
+    irrelevant-files: &nova-base-irrelevant-files
+      - ^api-.*$
+      - ^(test-|)requirements.txt$
+      - ^.*\.rst$
+      - ^.git.*$
+      - ^doc/.*$
+      - ^nova/hacking/.*$
+      - ^nova/locale/.*$
+      - ^nova/policies/.*$
+      - ^nova/tests/.*$
+      - ^nova/test.py$
+      - ^releasenotes/.*$
+      - ^setup.cfg$
+      - ^tools/.*$
+      - ^tox.ini$
     vars:
       tox_envlist: all
       tempest_test_regex: (^tempest\..*compute\..*(migration|resize|reboot).*)