tests/scripts: Fix minikube script for libvirt
tests/scripts: Fix minikube script for libvirt

The minikube script now uses the proper disk path (vda) when minikube is
configured to run with the libvirt driver.

Signed-off-by: Kaushal M <6114cda83a9cffdec58aade10dbd71577eeec67d@gmail.com>

rook/nfs,rook/rook,rook/rook,rook/rook,rook/rook,rook/nfs,rook/nfs,rook/rook