Remove buck based STC jobs for master and 1.15 branches

Change-Id: I3ca8d24ce0a00933a4a54fb4df36d29d833363a3
diff --git a/jjb/onos/onos-verify.yaml b/jjb/onos/onos-verify.yaml
index 17f49e8..bec79ea 100644
--- a/jjb/onos/onos-verify.yaml
+++ b/jjb/onos/onos-verify.yaml
@@ -837,11 +837,9 @@
     build-node: 'ubuntu16.04-basebuild-8c-15g'
 
     stream:
-      - 'master'
       - 'onos-1.12'
       - 'onos-1.13'
       - 'onos-1.14'
-      - 'onos-1.15'
 
     jobs:
       - 'onos-{stream}-stc-verify'
@@ -869,11 +867,9 @@
     build-node: 'ubuntu16.04-basebuild-8c-15g'
 
     stream:
-      - 'master'
       - 'onos-1.12'
       - 'onos-1.13'
       - 'onos-1.14'
-      - 'onos-1.15'
 
     jobs:
       - 'onos-{stream}-stc-hag-verify'