Define new parallel jenkins jobs for fabric-tna

parallelized execution of fabric-tna jobs running one profile plus architecture, each.

Shift from bash scripts to declarative pipeline.

Change-Id: I38c8f8e8c24e7b72e5025c56123e3a21717a600d
diff --git a/jjb/defaults.yaml b/jjb/defaults.yaml
index ba88535..042121c 100644
--- a/jjb/defaults.yaml
+++ b/jjb/defaults.yaml
@@ -28,6 +28,8 @@
     #  https://jenkins.onosproject.org/configure
     build-node: ubuntu16.04-basebuild-1c-1g
 
+    medium-build-node: ubuntu16.04-basebuild-4c-8g
+
     # Powerful node, this type of node should be used for bazel builds.
     bigger-build-node: ubuntu16.04-basebuild-8c-15g