Migrate to ARM Ubuntu18.04 node

Ubuntu 16.04 still has SSH and Kernel issues.
Migrating to Ubuntu18.04 since we have a good
instance now.

TODO: Disable Ubuntu16.04 arm nodes.
- Currently Ubuntu18.04 arm nodes are under more test.
- No additional costs since no job is using 16.04 arm
  nodes.
- Once confirmed, these will be disabled.

Change-Id: I1ef6dfc04aa6e85531f824e24ad517137a7080ca
Issue-ID: CIMAN-33
Signed-off-by: Jessica Wagantall <jwagantall@linuxfoundation.org>
diff --git a/jjb/vnfsdk/vnfsdk-dovetail-integration-python.yaml b/jjb/vnfsdk/vnfsdk-dovetail-integration-python.yaml
index 8ce93b7..291011c 100644
--- a/jjb/vnfsdk/vnfsdk-dovetail-integration-python.yaml
+++ b/jjb/vnfsdk/vnfsdk-dovetail-integration-python.yaml
@@ -44,7 +44,7 @@
 #      - 'master':
 #          branch: 'master'
 #    mvn-settings: 'vnfsdk-dovetail-integration-settings'
-#    build-node: ubuntu1604-docker-arm64-4c-2g
+#    build-node: ubuntu1804-docker-arm64-4c-2g
 #    jobs:
 #      - '{project-name}-{stream}-docker-java-daily':
 #          docker-pom: 'pom.xml'