Switch cord-tester to cord-6.1 branch

Change-Id: I1e9dec119498d2d619ca8c96e2247dc07e8e2ae6
diff --git a/default.xml b/default.xml
index eec7273..04fecbc 100644
--- a/default.xml
+++ b/default.xml
@@ -25,7 +25,7 @@
 <project path="onos-apps/apps/vtn" name="vtn" groups="onos"/>
 <project path="onos-apps/apps/sadis" name="sadis" groups="onos"/>
 
-<project path="test/cord-tester" name="cord-tester" groups="test"/>
+<project path="test/cord-tester" name="cord-tester" groups="test" revision="cord-6.1"/>
 <project path="test/fabric-oftest" name="fabric-oftest" groups="test"/>
 
 <project path="orchestration/xos" name="xos" groups="orchestration"/>