With [1] included in alembic-1.12.0 the unit test
test_autogen_process_directives fails as it was
expecting 'type_' param in Autogenerated output.
But this is not included with 1.12.0 by default,
this patch enhances the regex to care only for relevant
parameters.
[1] https://github.com/sqlalchemy/alembic/commit/733197e
Closes-Bug: #2034016
Change-Id: I088cc4b260cccf6be2963d23a76a05f11cfccf2c