Unsightly traceback from Vagrant provider errors

[hakamadare]

$ nepho stack up
––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
 Using default command scope nepho-cas vagrant-single-host
––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
 - Downloading box ubuntu-server-12042-x64
Downloading box from URL: http://puppet-vagrant-boxes.puppetlabs.com/ubuntu-server-12042-x64-vbox4210.box
Extracting box...te: 2504k/s, Estimated time remaining: 0:00:01)
The box you're attempting to add already exists:

Name: ubuntu-server-12042-x64
Provider: virtualbox
Traceback (most recent call last):
  File "/Users/huit/.virtualenvs/nepho/bin/nepho", line 9, in <module>
    load_entry_point('nepho==1.2.2', 'console_scripts', 'nepho')()
  File "/Users/huit/python/nepho/nepho/nepho/cli/bootstrap.py", line 29, in run
    app.run()
  File "/Users/huit/.virtualenvs/nepho/lib/python2.7/site-packages/cement-2.2.0-py2.7.egg/cement/core/foundation.py", line 520, in run
    self.controller._dispatch()
  File "/Users/huit/.virtualenvs/nepho/lib/python2.7/site-packages/cement-2.2.0-py2.7.egg/cement/core/controller.py", line 455, in _dispatch
    func()
  File "/Users/huit/.virtualenvs/nepho/lib/python2.7/site-packages/cement-2.2.0-py2.7.egg/cement/core/controller.py", line 461, in _dispatch
    func()
  File "/Users/huit/python/nepho/nepho/nepho/cli/stack.py", line 121, in create
    s.provider.deploy(self.app)
  File "/Users/huit/python/nepho/nepho/nepho/providers/vagrant_provider.py", line 84, in deploy
    execute('vagrant box add %s %s' % (name, url))
  File "/Users/huit/python/nepho/nepho/nepho/core/common.py", line 42, in execute
    raise subprocess.ProcessException(command, exitCode, output)
AttributeError: 'module' object has no attribute 'ProcessException'

[robparrott]

Looks like the subprocess.ProcessException() method does not exist. Need to raise an OSError instead.

[robparrott]

This ought to be fixed by the commit.