debian 6 test: deal with multiple packages (#474)
debian 6 test: deal with multiple packages (#474)

* debian 6 test: deal with multiple packages

The ./cmd/fsnotify doesn't have any tests, but sooner or later we'll
have subpackages so deal with it properly now.

* Cache vagrant boxes
fsnotify/fsnotify,fsnotify/fsnotify,fsnotify/fsnotify