CORD-3025 adding build node to aaa-gerrit job

Change-Id: I9b5daa8055ebf81f58ac82262b6b9e5502fed89e
diff --git a/jjb/aaa.yaml b/jjb/aaa.yaml
index 7d676c1..2a032ab 100644
--- a/jjb/aaa.yaml
+++ b/jjb/aaa.yaml
@@ -34,3 +34,5 @@
       - cord-infra-properties:
           build-days-to-keep: '{build-days-to-keep}'
           artifact-num-to-keep: '{artifact-num-to-keep}'
+
+    node: 'ubuntu16.04-basebuild-1c-2g'