Wait longer for KVM to come up with base VM
Wait longer for KVM to come up with base VM

On some systems (observed on Fedora 22), five seconds may not be long
enough for the base VM to come up and be ready to accept keyboard input.

This patch increases the time from 5 to 10 seconds.

Change-Id: Ia43dae20ae037cca691971ce6af71ba9af64df07

openstack/training-labs,openstack/training-labs,openstack/training-labs