Trying to run `salt-master` on `Vagrant` running `Ubuntu`, 

no edits to `/etc/salt/master`

I get:

```
vagrant@markvagrant:/etc/salt$ sudo salt-master -l all
[DEBUG   ] Reading configuration from /etc/salt/master
[DEBUG   ] Configuration file path: /etc/salt/master
[TRACE   ] Trying pysss.getgrouplist for 'root'
[TRACE   ] Trying generic group list for 'root'
[TRACE   ] Group list for user 'root': []
[INFO    ] Setting up the Salt Master
[WARNING ] Unable to bind socket, error: [Errno 98] Address already in use
The ports are not available to bind

```

My Vagrantfile:

```
Vagrant.configure(2) do |config|
  config.vm.box = "ubuntu/trusty64"
  config.vm.network "private_network", ip: "192.168.2.2"
  config.vm.network "public_network"
  config.vm.hostname = "markvagrant"
  config.vm.synced_folder "./data", "/vagrant_data"
  config.vm.provider "virtualbox" do |vb|
    vb.memory = "1024"
  end
end

```