There are multiple places throughout Murano docs that still
use the term "tenant". In order to help transition to v3
keystone API, these instances should be replaced with the word
"project".
All of the docs have been updated accordingly. I reference "tenant"
in parenthesis in a few appropriate places as a way to help with
any confusion during the transition.
Change-Id: I41de7c272198c471ae60fa47f3554085308dae68
Closes-Bug: #1514756