fix PATH to include preinstalled golang binaries

Change-Id: I195c1fec06db7ba90db33dca0e26e451bbe11293
diff --git a/jjb/python-unit.yaml b/jjb/python-unit.yaml
index 46cf357..0cc9c06 100644
--- a/jjb/python-unit.yaml
+++ b/jjb/python-unit.yaml
@@ -48,7 +48,7 @@
           # setup for go-based testing
           mkdir -p ~/go/src
           export GOPATH=~/go
-          export PATH=$PATH:/usr/lib/go-1.10/bin:$GOPATH/bin
+          export PATH=$PATH:/usr/lib/go-1.10/bin:/usr/local/go/bin:~/go/bin
 
           if [ -f 'Makefile' ]; then
             echo "Makefile found, running 'make test'"