fix path to buck

Change-Id: Ic4e0484b9e990b830f1dc26254119b552366e71b
diff --git a/jjb/onos/onos-verify.yaml b/jjb/onos/onos-verify.yaml
index ac5d932..dee3eff 100644
--- a/jjb/onos/onos-verify.yaml
+++ b/jjb/onos/onos-verify.yaml
@@ -92,7 +92,7 @@
     builders:
     #put shell scripts in file then make sure shell check is installed on verify vms
       - shell: |
-            source tools/build/envDefaults
+            . tools/build/envDefaults
             echo $PATH
             onos-buck build onos
             onos-buck test