Add support for onos-2.6 in Jenkins pipelines

Change-Id: I2659741aa148bbb1e94f50a7f868658cadf66f11
diff --git a/jjb/OnosSystemTest/onos-test-freestyle.yaml b/jjb/OnosSystemTest/onos-test-freestyle.yaml
index 1f310a2..53d5662 100644
--- a/jjb/OnosSystemTest/onos-test-freestyle.yaml
+++ b/jjb/OnosSystemTest/onos-test-freestyle.yaml
@@ -20,6 +20,7 @@
       - '2.3'
       - '2.4'
       - '2.5'
+      - '2.6'
       - 'master'
       - 'manually'
 
diff --git a/jjb/OnosSystemTest/onos-test-pipeline.yaml b/jjb/OnosSystemTest/onos-test-pipeline.yaml
index 25e4503..4c332e8 100644
--- a/jjb/OnosSystemTest/onos-test-pipeline.yaml
+++ b/jjb/OnosSystemTest/onos-test-pipeline.yaml
@@ -47,6 +47,7 @@
       - '2.3'
       - '2.4'
       - '2.5'
+      - '2.6'
       - 'master'
       - 'manually'
 
@@ -299,6 +300,7 @@
          name: ONOSbranch
          choices:
            - 'master'
+           - 'onos-2.6'
            - 'onos-2.5'
            - 'onos-2.4'
            - 'onos-2.3'