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-cacher.yaml b/jjb/aai/aai-cacher.yaml
index a578d49..30b06d5 100644
--- a/jjb/aai/aai-cacher.yaml
+++ b/jjb/aai/aai-cacher.yaml
@@ -11,7 +11,7 @@
           maven-versions-plugin: true
       - gerrit-maven-docker-stage:
           mvn-params: '-P docker -Dmaven.test.skip=true'
-          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':
@@ -26,7 +26,7 @@
     mvn-version: 'mvn35'
     files: '**'
     archive-artifacts: ''
-    build-node: ubuntu1604-builder-4c-4g
+    build-node: ubuntu1804-builder-4c-4g
 
 - project:
     name: aai-cacher-sonar
@@ -38,7 +38,7 @@
     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/cacher'
     project-name: 'aai-cacher'
     branch: 'master'