Add support for multi-stack installation

Cleanup use of sudo for copying files. Apply docker specific
configuration inside user directory.

Utilize multiple juju controllers utilizing the stack name.

Create stack with no exposed host ports via '-nohostports' for creating
multiple instances of osm (useful in CI)

Change-Id: I32e2eab2cbae7fa6939eee2df556f6788d065a92
Signed-off-by: Mike Marchetti <mmarchetti@sandvine.com>