Trigger a job to run a standalone deploy with IPA on multinode

This review triggers the job:
tripleo-ci-centos-8-standalone-on-multinode-ipa
to create a multinode setup of two nodes having FreeIPA
server along with standalone deployment

Change-Id: I2f0b0bbcdc7b162f0f25851f20bcdb342ac5b645

zuul.d/layout.yaml

@@ -18,6 +18,11 @@
             files:
               - ^roles/.*minion.*$
               - ^playbooks/.*minion.*$
+        - tripleo-ci-centos-8-standalone-on-multinode-ipa:
+            files:
+              - ^roles/.*multinode-ipa.*$
+              - ^roles/standalone.*$
+              - ^playbooks/multinode-standalone-ipa.yml.*$
     gate:
       queue: tripleo
       jobs: