Rally & Tempest integration (base) - part 2

Add ability to specify sets of tempest tests and regexps for tests.

Usage:
rally verify start --deploy-id=<deploy_id> --set=<set_name> --regex=<regex>

Available sets: smoke (by default), full, baremetal, compute, data_processing,
identity, image, network, object_storage, orchestration, telemetry, volume.

Change-Id: Icc9cb24e3feeb4ad6f80b311cf30bc2cf5ba9c65
Related: blueprint tempest-verification