Adds a parameter to turn off dkms for kernel
module.
By default the old behaviour of the modules stays.
On RedHat this parameter has no function.
Dkms Package for openvswitch are not available
on Debian newer than wheezy and Ubuntu newer
than utopic (or on backports). Which makes
the manifests fail on these systems whithout
setting dkms_ensure to false.
Add some initial rspec tests.
Change-Id: Id20ed728e9ed416ae0ff40e26d61ba3ca022355c
