Now we have different providers, but the error message didn't tell
anything about it. Suppose I want to remove one of my boxes:
vagrant box remove opscode-ubuntu-12.04 vritualbox
There is a typo in provider name. The error message is:
Box 'opscode-ubuntu-12.04' could not be found.
Therefore I need to double check the box name, and only than I will see
the typo.
This commit make the error message looks like this:
Box 'opscode-ubuntu-12.04' with 'vritualbox' provider could not be
found.
