There are still fwaas_v1 exceptions and definitions in
neutron-lib, it is necessary to remove them because the
fwaas_v1 code has been removed in the Stein cycle[1] and
the related extensions will be removed.
[1] https://review.opendev.org/#/c/616410/
Depends-On: https://review.opendev.org/#/c/692094/
Change-Id: Ibfc6dab327c9df59222cda3e6a1f5dc566aa1bde
Closes-bug: #1850602