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/update-api-reference-docs.sh

@@ -22,14 +22,15 @@ set -o nounset
 set -o pipefail
 
 KUBE_ROOT=$(dirname "${BASH_SOURCE}")/..
-DEFAULT_OUTPUT_PATH="$PWD/${KUBE_ROOT}/docs/api-reference"
+REPO_DIR=${REPO_DIR:-"${PWD}/${KUBE_ROOT}"}
+DEFAULT_OUTPUT_PATH="${REPO_DIR}/docs/api-reference"
 OUTPUT=${1:-${DEFAULT_OUTPUT_PATH}}
 
 echo "Generating api reference docs at ${OUTPUT}"
 
 V1_PATH="${OUTPUT}/v1/"
 V1BETA1_PATH="${OUTPUT}/extensions/v1beta1"
-SWAGGER_PATH="$PWD/${KUBE_ROOT}/api/swagger-spec/"
+SWAGGER_PATH="${REPO_DIR}/api/swagger-spec/"
 
 echo "Reading swagger spec from: ${SWAGGER_PATH}"