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Fixes issue #5022

Add basic support for Docker related commands.

Vagrant 1.6 introduced the `global-status` command which allows
to get a quick overview of all active Vagrant environments for the
currently logged in user.

Vagrant 1.5 added Vagrant Cloud to share boxes. Some boxes
may be protected, the `login` command allows to access those
protected boxes from Vagrant Cloud.

Vagrant 1.5 introduced Vagrant Share to allow remote access to a Vagrant
environment. This adds support for the `share` and `connect` commands.

Vagrant 1.6 introduces a couple new commands, including the `version` command.
The `version` command shows the currently installed version information and
also checks for new updates available.

Rendering the 'vagrant box (remove|repackage)' completion code independant of Vagrant implementation details.

updated to match new vagrant 1.1.x command list

Rendering the 'vagrant box (remove|repackage)' completion code independant of Vagrant implementation details.

For multi-VM setups some commands take the name of
a virtual machine.  Read the Vagrantfile and offer
suggestions.