Add onos-2.0 testing jobs

Change-Id: I0043f27b7da55e823ef381f30511170cc463aa01
diff --git a/jjb/OnosSystemTest/onos-test-freestyle.yaml b/jjb/OnosSystemTest/onos-test-freestyle.yaml
index 4b515ec..08b6e78 100644
--- a/jjb/OnosSystemTest/onos-test-freestyle.yaml
+++ b/jjb/OnosSystemTest/onos-test-freestyle.yaml
@@ -14,6 +14,7 @@
       - '1.13'
       - '1.14'
       - '1.15'
+      - '2.0'
       - 'master'
       - 'manually'
 
@@ -563,7 +564,7 @@
 
     <<: *test-free-init-procedure-plate
 
-    sr-version-before-previous: '1.14'
+    sr-version-before-previous: '2.0'
     sr-version-previous: '1.15'
     sr-version-current: 'master'