Add push-upstream jobs for multiple branches

Change names of all push-upstream jobs to match new template

Change-Id: I1bbb7efca78a3206bc77cfa06b9b1d8400ac3d07
Signed-off-by: econwar <conor.ward@est.tech>
diff --git a/jjb/policy/policy-distribution-push-upstream-jobs.yaml b/jjb/policy/policy-distribution-push-upstream-jobs.yaml
index 36854f2..82ff3df 100644
--- a/jjb/policy/policy-distribution-push-upstream-jobs.yaml
+++ b/jjb/policy/policy-distribution-push-upstream-jobs.yaml
@@ -23,6 +23,9 @@
     name: policy-distribution-push-upstream
     project: policy/distribution
     project-name: policy-distribution
-    branch: master
+    stream:
+      - master:
+          branch: '{stream}'
+
     jobs:
-      - '{project-name}-push-upstream'
+      - '{project-name}-{stream}-push-upstream'