CORD-3.0 is deprecated, remove from test targets

Change-Id: I123594a3cd0d0ccd933db77eee399828696cde0b
diff --git a/jjb/cord/cord-xos-gui-unit.yaml b/jjb/cord/cord-xos-gui-unit.yaml
index 749aa74..8be2b37 100644
--- a/jjb/cord/cord-xos-gui-unit.yaml
+++ b/jjb/cord/cord-xos-gui-unit.yaml
@@ -96,7 +96,6 @@
       - 'cord-5.0'
       - 'cord-4.1'
       - 'cord-4.0'
-      - 'cord-3.0'
 
     jobs:
       - 'cord-xos-gui-unit-{stream}'