fix ssh key placement

Signed-off-by: rootfs <hchen@redhat.com>
restructure vagrant tree, make recipe lean, making easy to add new provider

Signed-off-by: rootfs <hchen@redhat.com>
review feedback

Signed-off-by: rootfs <hchen@redhat.com>
Merge pull request #524 from rootfs/vagrant-reorg

restructure Vagrant, making recipe lean and easy to augment