Refers to #87 (closed)
This PR provides support for LibVirt/QEmu/KVM when deploying the local grid with vagrant and morph.
And the support for Virtualbox has been removed.
The documentation has been updated accordingly (see morph/grid/local/README.rst).
TODO: This branch is based on production to avoid a known issue on develop (with zkap). It should probably be rebased onto or merged with develop before review...