Enable tempest/savanna gate tests

* voting for check and gate pipelines in savanna;
* non-voting for check pipeline in tempest and devstack;
* replace all 'full' jobs with smoke only (currently we're working only
  smoke tests for savanna in tempest);
* node: 'devstack-precise || devstack-precise-check' for non-voting jobs.

Change-Id: Ia4cd9106033fbfada5f0cbf8c38d07d0e915edb0
Merge "Enable tempest/savanna gate tests"