Stable -> 2.2.1

Change-Id: I9d82bcaa839fd4ad900a2eebd88c2a7eb4295659
diff --git a/jobs.yaml b/jobs.yaml
index ccf4ceb..502ddd0 100644
--- a/jobs.yaml
+++ b/jobs.yaml
@@ -44,7 +44,7 @@
     flavor:
       - trusty32server
       - trusty64server
-    branch: '2.2.0'
+    branch: '2.2.1'
     tag: '-stable'
     jobs:
       - 'mininet-{flavor}{tag}'