Make sure to purge open-vm-tools before installing

This is needed on Debian, because if the pkg is just deinstalled, the config
files are still present and the vmware-tools installer want to its job.

Basically he does install the kernel modules, but no CLI tools at all.

This will keep the puppet module reinstalling the tools in a cycle.

In addition added ordering to ensure dependencies being checked before
unpacking or installing.
Fix version detection for wrecked vmware-tools install

I found a broken version of vmware-tools, basically the vmware-toolbox-cmd
returned nothing. Not for -v or --help.

The change allows the fact to say that a version is installed, but its unknown
which.

This should trigger a clean update (or reinstall).
Merge pull request #49 from lazyfrosch/master

Purging open-vm-tools and fact fix