vagrant: disable QEMU session support
vagrant: disable QEMU session support

vagrant-libvirt supports using QEMU user sessions to maintain Vagrant
VMs, and some distros turn it ON by default.

After upgrading to Fedora32 I have noticed `vagrant up` fails with a huge call
trace and disabling QEMU session worked.

More read:
https://github.com/vagrant-libvirt/vagrant-libvirt#qemu-session-support
https://fedoraproject.org/wiki/Changes/Vagrant_2.2_with_QEMU_Session

Signed-off-by: Prasanna Kumar Kalever <a78d8f98557446023f5b3ba9944d7be259a978a3@redhat.com>

JohnStrunk/k8s-cluster