Move where we install and configure docker
Move where we install and configure docker

Make this the last item we do in prepare.sh. This allows the rest
of the configuration to run through completely.

Signed-off-by: Kyle Mestery <9cfbda34e625c7b0454bcb19a48d07c46f9097d2@mestery.com>

openvswitch/ovn-scale-test,sivakom/ovn-scale-test,openvswitch/ovn-scale-test,sivakom/ovn-scale-test