Modify jenkins unit/integration scripts to work on branches

Also add a makefile. This will need a cherrypick onto 1.0,1.1
with edits to hack/jenkins/test-dockerized.sh to run branch-specific
test scripts.

Also had to modify hack/verify-api-reference.sh to handle volume mount
path peculiarity when doing `docker run -v` inside a container started
with `docker run -v`. See associated comment in
hack/jenkins/test-dockerized.sh

hack/jenkins/gotest-dockerized.sh

@@ -0,0 +1,46 @@
+#!/bin/bash
+
+# Copyright 2015 The Kubernetes Authors All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -o errexit
+set -o nounset
+set -o pipefail
+set -o xtrace
+
+export REPO_DIR=${REPO_DIR:-$(pwd)}
+
+# Produce a JUnit-style XML test report for Jenkins.
+export KUBE_JUNIT_REPORT_DIR=${WORKSPACE}/_artifacts
+
+# Run the kubekins container, mapping in docker (so we can launch containers),
+# the repo directory, and the artifacts output directory.
+#
+# Note: We pass in the absolute path to the repo on the host as an env var incase
+# any tests that get run need to launch containers that also map volumes.
+# This is required because if you do
+#
+# $ docker run -v $PATH:/container/path ...
+#
+# From _inside_ a container that has the host's docker mapped in, the $PATH
+# provided must be resolvable on the *HOST*, not the container.
+
+docker run --rm=true \
+  -v /var/run/docker.sock:/var/run/docker.sock \
+  -v "$(which docker)":/bin/docker \
+  -v "${REPO_DIR}":/go/src/k8s.io/kubernetes \
+  -v "${KUBE_JUNIT_REPORT_DIR}":/workspace/artifacts \
+  --env REPO_DIR="${REPO_DIR}" \
+  -it gcr.io/google_containers/kubekins-test:0.1 \
+  bash -c "cd kubernetes && ./hack/jenkins/test-dockerized.sh"