virtctl: Be less verbose when forwarding in stdio mode
virtctl: Be less verbose when forwarding in stdio mode

This changes the verbosity of the port-forwarding destination in stdio
mode to 3 so it is no logged by default.

Signed-off-by: Felix Matouschek <d5fbe2d618e1c455cad8aae93704618a66caf026@redhat.com>

kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt,kubevirt/kubevirt