Make sample file use %(tenant_id)s macro
Make sample file use %(tenant_id)s macro

The sample file uses a fixed value for Heat and Swift endpoints
instead of using the $(tenant_)s.  Change to use $(tenant_id)s
macro in the examples instead of suggesting to use hard-coded
values.

Change-Id: I68335244cc205b26b7de0b91762b6cff3e83874f

knowncitizen/tripleo-ui,knowncitizen/tripleo-ui,knowncitizen/tripleo-ui,knowncitizen/tripleo-ui