test host-port argument combinations

[gfrlv]

Description

Added tests for combinations of --host and --port They obviously require the database server to be installed locally, se they are marked with the tag requires_local_db that can be used to exclude the new tests from a run:

    behave test/features --no-capture --tag="not requires_local_db"

Checklist

• [x] I've added this contribution to the changelog.md.
• [x] I've added my name to the AUTHORS file (or it's already there).