ref(user-data.sample): configure fleet without overwriting unit file

We can configure the fleet public_ip with cloud-config, so let's do that
without overwriting the default unit.
Merge pull request #153 from carmstrong/vanilla_userdata

ref(user-data.sample): configure fleet without overwriting unit file
Automatically acquire a new etcd discovery token

Since we're loading a ruby file anyway, might as well automate the manual step away
Merge pull request #156 from christianromney/master

Automatically acquire a new etcd discovery token
Only generate new token on vagrant up

Signed-off-by: Christian Romney <cromney@pointslope.com>
Merge pull request #160 from christianromney/master

Only generate new etcd token on vagrant up
Merge branch 'master' into coreos-vagrant-dev