[SDFAB-189] Update ONOS CI and test new image

This is the part 3. Use new ubuntu 20.04 based
executor for release and docker jobs

Change-Id: I0d1e08fb89b9f74f3488b726b5c1b2227ba22444
diff --git a/jjb/onos/onos-verify.yaml b/jjb/onos/onos-verify.yaml
index e517f48..e0adeab 100644
--- a/jjb/onos/onos-verify.yaml
+++ b/jjb/onos/onos-verify.yaml
@@ -841,7 +841,7 @@
     project: onos
 
     build-timeout: '240'
-    build-node: 'ubuntu16.04-basebuild-8c-15g'
+    build-node: 'ubuntu20.04-basebuild-8c-15g'
 
     stream: 'master'
 
@@ -854,7 +854,7 @@
     project: onos
 
     build-timeout: '90'
-    build-node: 'ubuntu16.04-basebuild-8c-15g'
+    build-node: 'ubuntu20.04-basebuild-8c-15g'
 
     stream: 'master'
 
@@ -867,7 +867,7 @@
       project: onos
 
       build-timeout: '240'
-      build-node: 'ubuntu16.04-basebuild-8c-15g'
+      build-node: 'ubuntu20.04-basebuild-8c-15g'
 
       stream:
           - 'master'
@@ -883,7 +883,7 @@
       project: onos
 
       build-timeout: '240'
-      build-node: 'ubuntu16.04-basebuild-8c-15g'
+      build-node: 'ubuntu20.04-basebuild-8c-15g'
 
       stream:
           - 'onos-2.7'