Upgrade some policy repos to 18.04

These 4 repos compile fine in an ubuntu VM so they are
safe to be upgraded.

drools-pdp hangs, apex fails, engine cannot bind, and
distribution fails. They will need further reviews to
determine if its simply a VM configuration error or
a ubuntu issue (highly doubtful).

Issue-ID: POLICY-2437
Change-Id: I9ff155bd44b49de10b7b49143fbd85e59f5464ae
Signed-off-by: Pamela Dragosh <pdragosh@research.att.com>
diff --git a/jjb/policy/policy-models.yaml b/jjb/policy/policy-models.yaml
index 8b85b6e..0b9e637 100644
--- a/jjb/policy/policy-models.yaml
+++ b/jjb/policy/policy-models.yaml
@@ -20,7 +20,7 @@
     java-version: openjdk11
     files: '**'
     archive-artifacts: ''
-    build-node: ubuntu1604-builder-4c-4g
+    build-node: ubuntu1804-builder-4c-4g
 
 - project:
     name: policy-models-sonar
@@ -32,7 +32,7 @@
     sonarcloud-project-key: '{sonarcloud_project_organization}_{project-name}'
     sonar-mvn-goal: '{sonar_mvn_goal}'
     cron: '@daily'
-    build-node: ubuntu1604-builder-4c-4g
+    build-node: ubuntu1804-builder-4c-4g
     project: 'policy/models'
     project-name: 'policy-models'
     branch: 'master'