Fix vagrant bootstrapping for ubuntu

The ubuntu-bootstrap.sh script used by vagrant to provision ubuntu
boxes was lacking many of the features of centos-bootstrap.sh. For
instance, ubuntu-bootstrap.sh did not install kolla, so the kolla-build
executable was not available after initial provisioning.
This patch adapts the bootstrap script to match the centos bootstrap
script as closely as possible.

Change-Id: I6cdacb993a9b6856912ea7cfb73a28f3867f472a
Closes-Bug: #1547114