Fix telemetry-tempest-plugin scenario tests

If we run tests via tempest, gabbi return dictionary with unicode objects
(https://github.com/openstack/telemetry-tempest-plugin/blob/05b95d28400f82a9e69c7c99207844b80ae3607f/telemetry_tempest_plugin/scenario/test_telemetry_integration.py#L103),
but then it wait string value

Change-Id: Ibbceb740da2e67e09371622e3d88836c396c1383
Related-PROD: PROD-18307
Co-Authored-By: BubaVV <vmarkov@mirantis.com>
1 file changed