Node e2e Makefile support for running remote tests against kubernetes-node-e2e-images.

Also includes other improvements:
- Makefile rule to run tests against remote instance using existing host or image
- Makefile will reuse an instance created from an image if it was not torn down
- Runner starts gce instances in parallel with building source
- Runner uses instance ip instead of hostname so that it doesn't need to resolve
- Runner supports cleaning up files and processes on an instance without stopping / deleting it
- Runner runs tests using `ginkgo` binary to support running tests in parallel

test/e2e_node/jenkins/e2e-node-jenkins.sh

@@ -29,7 +29,10 @@ set -x
 . $1
 
 go build test/e2e_node/environment/conformance.go
+
+WORKSPACE=${WORKSPACE:-"/tmp/"}
 ARTIFACTS=${WORKSPACE}/_artifacts
+
 mkdir -p ${ARTIFACTS}
 go run test/e2e_node/runner/run_e2e.go  --logtostderr --vmodule=*=2 --ssh-env="gce" \
   --zone="$GCE_ZONE" --project="$GCE_PROJECT" --image-project="$GCE_IMAGE_PROJECT" \

test/e2e_node/jenkins/jenkins-ci.properties

@@ -11,6 +11,6 @@ GCE_ZONE=us-central1-f
 GCE_PROJECT=kubernetes-jenkins
 GCE_IMAGE_PROJECT=kubernetes-jenkins
 CLEANUP=true
-GINKGO_FLAGS=--ginkgo.skip=FLAKY
+GINKGO_FLAGS=--skip=FLAKY
 SETUP_NODE=false
 

test/e2e_node/jenkins/jenkins-pull.properties

@@ -11,5 +11,5 @@ GCE_ZONE=us-central1-f
 GCE_PROJECT=kubernetes-jenkins-pull
 GCE_IMAGE_PROJECT=kubernetes-jenkins-pull
 CLEANUP=true
-GINKGO_FLAGS=--ginkgo.skip=FLAKY
+GINKGO_FLAGS=--skip=FLAKY
 SETUP_NODE=false