ConcurrentInstancesTest and ControlBoardOnMultipleGazeboInstancesTest non-deterministic crash

[traversaro]

Similar to #200, these two tests still crash non deterministically. Unfortunately, the problem is upstream in gz-physics/dartsim/ode (see gazebosim/gz-sim#18 and #153) .

While this does not fix the problem in general, I think we should at least switch to another DART's collision detector (not ODE, that has this multithreading problems) in the tests, to ensure that they run reliably.

[traversaro]

Apparently the world already have some tags:

        <physics type="ignored">
            <dart>
                <collision_detector>dart</collision_detector>
            </dart>
        </physics>

but as the tests are still failing with ode-related errors, probably they are not read correctly.

[traversaro]

Apparently the world already have some tags:

        <physics type="ignored">
            <dart>
                <collision_detector>dart</collision_detector>
            </dart>
        </physics>

but as the tests are still failing with ode-related errors, probably they are not read correctly.

The reason is described (and fixed [or actually worked around, the real fix would be to remove non-thread safe functions from ODE]) in gazebosim/gz-physics#675 . However, even if the PR is accepted it will take some time to get release, for the time being we can continue with --repeat until-success:20.