Tenant to Project in Back ends

A continuation of the process to convert the term tenant
to project.  These changes should only be visible in the
error messages produced, but should otherwise be
undetectable by calling programs.

Removes the TenantNotFound exception which propagates changes through
the code that calls the backends as well

Change-Id: I998a44bfd6aa85f67d58904bd7af25a56c73d48a
Merge "Tenant to Project in Back ends"