Update AAI jjbs to use ubuntu 1804

Issue-ID: AAI-2849
Change-Id: Ic808db184eb6536b6b60f04e1750633bd8bd44fb
Signed-off-by: Jimmy Forsyth <jf2512@att.com>
diff --git a/jjb/aai/aai-babel.yaml b/jjb/aai/aai-babel.yaml
index 9f3efcd..bdae075 100644
--- a/jjb/aai/aai-babel.yaml
+++ b/jjb/aai/aai-babel.yaml
@@ -17,7 +17,7 @@
           maven-versions-plugin: true
       - gerrit-maven-docker-stage:
           mvn-params: '-P docker -B -Dmaven.test.skip=true -Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=warn'
-          build-node: ubuntu1604-docker-8c-8g
+          build-node: ubuntu1804-docker-8c-8g
           container-public-registry: 'nexus3.onap.org:10001'
           container-staging-registry: 'nexus3.onap.org:10003'
       - '{project-name}-gerrit-release-jobs':
@@ -31,7 +31,7 @@
     mvn-settings: 'aai-babel-settings'
     files: '**'
     archive-artifacts: ''
-    build-node: ubuntu1604-builder-4c-4g
+    build-node: ubuntu1804-builder-4c-4g
 
 - project:
     name: aai-babel-sonar
@@ -43,7 +43,7 @@
     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: 'aai/babel'
     project-name: 'aai-babel'
     branch: 'master'