invoke 'dep ensure' when building sadis-server

Change-Id: I89adbac583e28f06c5f292e1d264bdbc0e697ca1
diff --git a/jjb/verify/sadis-server.yaml b/jjb/verify/sadis-server.yaml
index 8f51ae4..e02caf6 100644
--- a/jjb/verify/sadis-server.yaml
+++ b/jjb/verify/sadis-server.yaml
@@ -73,6 +73,8 @@
 
           pushd $GOPATH/src/gerrit.opencord.org/sadis-server
 
+          dep ensure -v -update
+
           go build -v
 
           go test -v ./...