We are migrating service clients to tempeset-lib, but we needed to
update many places by hands even if using the migration script.
There is a pattern of update, so this patch adds a new option
--service-client for updating them automatically.
We can use it like:
$ tools/migrate_from_tempest.sh -u ../tempest -s \
tempest/services/compute/json/availability_zone_client.py \
tempest/tests/services/compute/test_availability_zone_client.py \
tempest/api_schema/response/compute/v2_1/availability_zone.py
Partially implements blueprint migrate-service-clients-to-tempest-lib
Change-Id: Iab832501725cedd5c5fcc65d760ce8a9794223ac