Make the openvswitch DKMS package load before the openvswitch-switch packages
Add guard code to detect an already-loaded non-DKMS openvswitch module
(if we need one), and unload it if we can.
Only do the DKMS dance on Ubuntu

This is clearly Ubuntu-specific.
Merge pull request #109 from vuntz/blind-guess

https://github.com/crowbar/barclamp-quantum/pull/109

Merged by devtool for cloudsleuth