Example Submission causes time out

[chuanli11]

Lambda Scenarios timed out once the following is added to plugins/registry.py.

from submissions.example_team.example_scenario.plugin import ExampleScenarioPlugin

They worked without the above line. Increase 30 sec limit doesn't help.

Example Submission also times out -- I tried replacing the original SCENARIO_PLUGINS by the following:

SCENARIO_PLUGINS = {
    "portfolioiq": PortfolioIQPlugin,
    "thingularity": ThingularityPlugin,
    "example_scenario": ExampleScenarioPlugin,
}

[chuanli11]

Close this because this is expected -- the scenario is empty and for illustrative purpose.

See this PR for a real example submission.