Move testcases in the right tiers

Move testcases in the right tiers

Here are the moves:
  - tempest_smoke in healthcheck
  - tempest_full and tempest_scenario in smoke
  - rally_jobs in benchmarking

It avoids conflicts between benchmarking tools and few functional
tests (short timeouts).

Then it should allow running in parallel all testcases in one tiers.
It also allows cleaning the additional steps defined in releng.

rally_full could move in benchmarking in a second step.

Change-Id: I0bc657557a61c7d9bf7679b4f2dbda08c36728ca
Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>