Allow kwargs in create_keypair

As a part of the scenario/manager.py stabilization tracked by
the below BP the patch adds kwargs argument for create_keyapair
method so that the consumers are able to pass additional
parameters if needed.

Implements: blueprint tempest-scenario-manager-stable
Change-Id: Iee5dffcafc8a6870c8a7005870055a614eaafab8
1 file changed