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>
Fixed anoying typo

Anoying typo fixed
Fix pod status error with List method.
Initial version of a resource model.

Tweaks to reflect comments from thockin
Merge pull request #1126 from 7oku/master

Fixed annoying typo
Merge pull request #617 from johnwilkes/master

Add initial resources.md for discussion
Merge pull request #1127 from ddysher/pod-list

Fix pod status error with List method.
Unify Godoc formatting, fix various typos

Signed-off-by: Vojtech Vitek (V-Teq) <vvitek@redhat.com>
Add several missing pkg Godoc files

Signed-off-by: Vojtech Vitek (V-Teq) <vvitek@redhat.com>
Expand api ResourceVersioner test
Merge pull request #1131 from smarterclayton/add_versioner_test

Expand api ResourceVersioner test
Merge pull request #1129 from VojtechVitek/godoc

Godoc improvements
Step #1 in migrating the service controller away from the apiserver.
Start using the API server for listing services.
Split api into api, api/common, api/validation & apitools
Split helper test, move fuzzing to api package as serialization_test.go
Make validation work when not in the api package.
Propagate rename; tests pass again.
Combine pkg/apitools and pkg/api/common and call the result pkg/runtime
Disable running travis at tip, it's finding a bunch of races that don't seem to be our fault
Merge pull request #1125 from lavalamp/fixApi

pkg/api: Separation of concerns