Use native exec support in docker instead of execing nsinit in kubelet.
Rackspace - Switch to CoreOS for standard cluster

The Rackspace setup for Kubernetes now leverages CoreOS instead of Ubuntu. We've dropped Salt completely for our cluster.
Add Rackspace to build/release.sh

Updates to the build/release.sh scripts to upload build binaries to
Cloud Files.
remove hardcoded cloudfiles path and fix PORTAL_NET
Migrate Rackspace upload scripts to util.sh

The functions to upload built k8s tars to Cloud Files were incorrectly
placed in build/common.sh. These have been migrated to
cluster/rackspace/util.sh
Remove extra newline and update comments in util.sh
Bump up the default machine size on GCP.
Add unit test for namespace aware proxy
Do not require a writeable /vagrant
Merge pull request #1906 from roberthbailey/gce-config

Bump up the default machine size on GCP.
Merge pull request #1909 from derekwaynecarr/service_proxy_needs_namespace

Add unit test for namespace aware proxy
Sort of pods in test case was incorrect
Make vagrant scripts work with bash 3

Fixes #1890
Merge pull request #1891 from jbeda/vagrant-bash-fix

Make vagrant scripts work with bash 3
Merge pull request #1914 from smarterclayton/fix_pod_test_race

Sort of pods in test case was incorrect
Merge pull request #1913 from derekwaynecarr/move_network_closure

Do not require a writeable /vagrant
Adjust test in salt file to use boolean value
Merge pull request #1610 from satnam6502/salt

Salt configuration for fluentd to Elasticsearch
Pass arguments to td-agent with unquoted spaces
Merge pull request #1835 from satnam6502/fluentd-es-image

Pass arguments to td-agent with unquoted spaces