IDM cars break in multilane

[agalbachicar]

Description

In PR #9173, where multilane is added to automotive_demo, adding IDM cars to multilane_onramp_merge scenario makes the simulation end with:

abort: Failure at bazel-out/k8-dbg/bin/systems/analysis/_virtual_includes/simulator/drake/systems/analysis/simulator.h:613 in StepTo(): condition 'next_sample_time >= step_start_time' failed.

A similar issue was reported in #8045 .

Reproduction

To reproduce, IDM cars should be added to automotive_demo with multilane_onramp_merge scenario.

To run it:

bazel run //automotive:demo -- --visualizer --with_multilane_onramp --multilane_num_lanes=3 --num_idm_controlled_maliput_railcar=1 

Debug Information

• What operating system are you running Drake on?

Ubuntu 16.04 from docker.

• Is this an issue with (a) C++, (b) Python, or (c) the distributed tools
  (e.g. drake-visualizer)?

(a) C++

• Are you (a) building drake from source, or (b) from a binary release?

(a) source

[sherm1]

Some extra info, not sure if it's helpful:
That error message comes from this sequence in Simulator::StepTo():

    const T step_start_time = context_->get_time();
    // ...
    // How far can we go before we have to take a sampling break?
    const T next_sample_time =
        system_.CalcNextUpdateTime(*context_, timed_events.get());
    DRAKE_DEMAND(next_sample_time >= step_start_time);

This indicates that CalcNextUpdateTime() returned a value earlier than the time that was passed in via the context. Or, possibly, one of the values here is NaN likely due to an earlier problem.

@edrumwri may have some further thoughts on how to debug this.

[jwnimmer-tri]

Per #11603, the automotive folder is deprecated, so I'll close this issue as "won't fix"; @jadecastro if this issue is still important to you, please re-open it in a different issue tracker.

\CC @liangfok FYI