Suppress non-error output of `systemctl enable`

The `systemctl enable` command ordinarily prints the `ln` command used
to enable the unit to stderr, but that's not ideal in the vagrant setup
because it gets printed in red, which should be reserved for errors, but
it's not a real error.

Set an environment variable to raise the log level to prevent `info`
messages from being printed to stderr (as they are not actually errors.)

I looked into the `systemctl` calls happening from the Salt setup script
to understand why they were not going to stderr, and it turns out the
Salt script will redirect all messages to stdout so they will all be
green regardless...

Tested:
- Started a fresh Vagrant cluster, confirmed no red messages in output
  when creating the cluster successfully. Successfully started nginx
  through Kubernetes using cluster/kubecfg.sh.
- Confirmed that the salt-api service was up after `vagrant up`:
  $ vagrant ssh master -c 'systemctl status salt-api.service'
  salt-api.service - The Salt API
     Loaded: loaded (/usr/lib/systemd/system/salt-api.service; enabled)
     Active: active (running) since Fri 2014-08-29 23:19:47 UTC; 11min ago
   Main PID: 2090 (salt-api)
     CGroup: /system.slice/salt-api.service
             +-2090 /usr/bin/python /usr/bin/salt-api
             +-2110 /usr/bin/python /usr/bin/salt-api

Signed-off-by: Filipe Brandenburger <filbranden@google.com>
Fix a wrong explaining text about running command to create replication controller.
Merge pull request #1041 from brendandburns/api

Add types for lifecycle events.
Merge pull request #1112 from filbranden/vagrant_salt_master2

Redirect output of `systemctl enable` to stdout
Include `-dirty` suffix in version info when building on a dirty tree

Ensure the output of `git describe` will include the `-dirty` suffix
when building on a tree with modified files in it.

Tested:
- ...

Signed-off-by: Filipe Brandenburger <filbranden@google.com>
Set gitMajor and gitMinor from hack/build-go.sh

Set the values of major and minor version based on the output of the
`git describe` command, which uses annotated tags as source of
versioning information.

Minor will get a "+" appended whenever the annotated tag does not match
the tree exactly (including when the tree is dirty.) So that only
official releases will have a "bare" minor version, all others will have
a "+" to indicate the binaries contain changes from the released version
in minor.

(This is similar to how versions of development builds of the Linux
kernel work.)

Tested:
- With no annotated tags:
  $ hack/build-go.sh
  $ _output/go/bin/kubecfg -version=raw
  version.Info{Major:"0", Minor:"1+", GitVersion:"v0.1+", GitCommit:"7d29873bdee87efacaace30ab3602297cacf1b4f", GitTreeState:"clean"}

- Tagging current version on a clean git tree:
  $ git tag -a -m 'Test tag v2.3' v2.3
  $ hack/build-go.sh
  $ _output/go/bin/kubecfg -version=raw
  version.Info{Major:"2", Minor:"3", GitVersion:"v2.3", GitCommit:"7d29873bdee87efacaace30ab3602297cacf1b4f", GitTreeState:"clean"}

- Tagging current version on a dirty git tree:
  $ git tag -a -m 'Test tag v2.3' v2.3
  $ touch test.txt  # this is enough to mark the tree as dirty
  $ hack/build-go.sh
  $ _output/go/bin/kubecfg -version=raw
  version.Info{Major:"2", Minor:"3+", GitVersion:"v2.3-dirty", GitCommit:"7d29873bdee87efacaace30ab3602297cacf1b4f", GitTreeState:"dirty"}

- Tagging a previous version on a clean tree:
  $ git tag -a -m 'Test tag v2.3' v2.3 HEAD~5
  $ hack/build-go.sh
  $ _output/go/bin/kubecfg -version=raw
  version.Info{Major:"2", Minor:"3+", GitVersion:"v2.3-6-g7d29873bdee87e", GitCommit:"7d29873bdee87efacaace30ab3602297cacf1b4f", GitTreeState:"clean"}

Signed-off-by: Filipe Brandenburger <filbranden@google.com>
workaround lack of jinja2.7 support
add sanity checking steps and fix KUBE_MASTER_IP
switch kubelets to connect to etcd on cloud network

Previously we were connecting across the public interfaces. This will connect across eth2 and send communication over a private network.
Merge pull request #1122 from filbranden/version_major_minor1

Push major and minor versions from git
Merge pull request #1124 from soundTricker/master

Fix a wrong explaining text about running command to create replication controllers.
Merge pull request #1120 from doublerr/rackspace/fix_salt_apiserver

Rackspace: fix apiserver salt config
Fixup name vs ID terminology
Merge pull request #1137 from derekwaynecarr/name_vs_id_fixup

Fixup name vs ID terminology
Add support for the PostStart event handler.