In one of the blazar ansible tasks in "bootstrap.yml", the admin
project name and username are hard-coded as "admin". OpenStack
users can define their admin project name and username differently
and the hard-coded names would cause authentication errors.
In addition, keystone identity api version 3 uses "os-project-name"
instead of "os-tenant-name". Although "os-tenant-name" might be
still accepatable, it's better to keep the latest.
Change-Id: Ie5c1016f9ce6f402ef208f3c295e6883a9edd8ab
Closes-bug: #1853462
f2d32d2e01