Add onos-2.6 to support branch

Change-Id: I248f4dc8a7bb722367b294e89205b279c681cb02
diff --git a/TestON/JenkinsFile/dependencies/branches.json b/TestON/JenkinsFile/dependencies/branches.json
index cf4682c..fb33761 100644
--- a/TestON/JenkinsFile/dependencies/branches.json
+++ b/TestON/JenkinsFile/dependencies/branches.json
@@ -12,5 +12,6 @@
         "onos-2.sb2": "2.1",
         "onos-2.sb3": "2.3",
         "onos-2.sb4": "2.4"
+        "onos-2.sb5": "2.6"
     }
 }