Tobiko is the testing framework which allows to do kind of "white box"
scenario testing. More info about it can be found at [1].
By adding devstack-tobiko-faults-centos job to out periodic queue we
will improve test coverage of our code as tobiko is testing e.g. L3ha in
that job. It also runs some scenarios, like e.g. restarting agents on
nodes, which can't be tested with tempest jobs.
[1] https://tobiko.readthedocs.io/en/latest/
Change-Id: I157645ed6d048de676dad5b2a93ab83a82880610
3cad670c97