In Ubuntu Bionic (18.04) mysql 5.7 version used to create
the user implicitly when using using the GRANT.
Ubuntu Focal (20.04) has mysql 8.0 and with mysql 8.0 there
is no implicit user creation with GRANT. We need to
create the user first before using GRANT command.
This patch updates tools/test-setup.sh so that keystone supports
ubuntu focal.
Story: #2007865
Task: #40190
Change-Id: I86d10729cfc7c02f12df611b56f6e263969dfe4b
Closes-Bug: #1885825