Allow kwargs in create_server_snapshot

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

Implements: blueprint tempest-scenario-manager-stable

Change-Id: I0ae3f86c546be6b3f5b1d427568cfdf2d26e37e0
1 file changed