Install godep as part of the Jenkins e2e job.

The godep binary is needed to build the Ginkgo test runner for e2e
tests.

hack/jenkins/e2e.sh

@@ -89,9 +89,13 @@ export CLUSTER_NAME=${E2E_CLUSTER_NAME}
 export ZONE=${E2E_ZONE}
 export KUBE_GKE_NETWORK=${E2E_NETWORK}
 
-export PATH=${PATH}:/usr/local/go/bin
+: ${GOPATH:="${WORKSPACE}/gopath"}
+export GOPATH
+
+export PATH=${GOPATH}/bin:${PATH}:/usr/local/go/bin
 export KUBE_SKIP_CONFIRMATIONS=y
 
+
 if [[ ${KUBE_RUN_FROM_OUTPUT:-} =~ ^[yY]$ ]]; then
     echo "Found KUBE_RUN_FROM_OUTPUT=y; will use binaries from _output"
     cp _output/release-tars/kubernetes*.tar.gz .
@@ -141,6 +145,9 @@ fi
 # Have cmd/e2e run by goe2e.sh generate JUnit report in ${WORKSPACE}/junit*.xml
 export E2E_REPORT_DIR=${WORKSPACE}
 
+# Install godep (needed to build the Ginkgo runner)
+go get github.com/tools/godep
+
 ### Set up ###
 go run ./hack/e2e.go ${E2E_OPT} -v --down
 go run ./hack/e2e.go ${E2E_OPT} -v --up