This adds:
  - AIO and multinode inventory samples
  - Password (blank) fields for default password.yml
  - Default to not enabled, in globals.yml

This is the last changeset in the series to add basic
Watcher functionality to Kolla.

Change-Id: I9daec0eadc8dad3d37e03e7d69783af003af0916
Closes-bug: #1598929
Partially-implements: blueprint watcher
Signed-off-by: Dave Walker (Daviey) <email@daviey.com>