This change adds a library of functions that are used by scripts running
inside the node VMs (i.e. scripts located in the scripts directory).
Many of them are specific to either Vagrant or osbash, so they might
get split out later on.
Partial-Bug: 1312764
Implements: blueprint openstack-training-labs
Change-Id: Ieb57e77bb65c562d3674b964af4ac28bc8766c65
