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

This is the part 1 (other changes will follow).
Use new ubuntu 20.04 based executor for bazel-verify jobs

Change-Id: Ifbaa21a50657ed0864a87b0962a1c7cc826d00c0
diff --git a/jjb/defaults.yaml b/jjb/defaults.yaml
index 042121c..146fe51 100644
--- a/jjb/defaults.yaml
+++ b/jjb/defaults.yaml
@@ -28,11 +28,18 @@
     #  https://jenkins.onosproject.org/configure
     build-node: ubuntu16.04-basebuild-1c-1g
 
+    ubuntu20-build-node: ubuntu20.04-basebuild-1c-1g
+
     medium-build-node: ubuntu16.04-basebuild-4c-8g
 
+    ubuntu20-medium-build-node: ubuntu20.04-basebuild-4c-8g
+
     # Powerful node, this type of node should be used for bazel builds.
     bigger-build-node: ubuntu16.04-basebuild-8c-15g
 
+    # Powerful node and new image, this type of node should be used for bazel builds.
+    ubuntu20-bigger-build-node: ubuntu20.04-basebuild-8c-15g
+
     # default gerrit server definition
     #server-name: 'ONOS Project Gerrit'
     gerrit-server-name: 'ONOS Project Gerrit'
diff --git a/jjb/onos/onos-verify.yaml b/jjb/onos/onos-verify.yaml
index ab312a8..d524e89 100644
--- a/jjb/onos/onos-verify.yaml
+++ b/jjb/onos/onos-verify.yaml
@@ -713,7 +713,7 @@
     project: onos
 
     build-timeout: '30'
-    build-node: 'ubuntu16.04-basebuild-8c-15g'
+    build-node: 'ubuntu20.04-basebuild-8c-15g'
 
     stream:
       - 'master'