Support the ability to ignore directories for ansible-lint job

For automation-tools repo, skip comac and comac-in-a-box directories

Change-Id: I1ea1e7b8ee84cd60f10962c67c6496a4912e7cd2
diff --git a/jjb/defaults.yaml b/jjb/defaults.yaml
index fbba5b5..57adfc6 100644
--- a/jjb/defaults.yaml
+++ b/jjb/defaults.yaml
@@ -178,3 +178,7 @@
     # Give the version of the JDK to use when building
     # Parameter is used with `update-java-alternatives --set <jdk-distribution>`
     jdk-distribution: 'java-11-amazon-corretto'
+
+    # skip directories
+    # Used to skip directories in supported tests
+    skip-dirs: ''