Fix Vagrant node registration and kube-push

[derekwaynecarr]

This makes the following fixes to the Vagrant setup:

1. Fix node kubelet registration. Kubelet uses cloud-provider now, and the vagrant provider was backed by the salt-api. The salt-api was previously only available on the master over 127.0.0.1. To make it accessible to the nodes, had to listen on the MASTER_IP, and update the cloud provider code to reference by host name.
2. Fix kube-push as recent versions of salt do not support --show-timeout flag

These changes make the cluster come up successfully.