Quickstart Examples Not Working

The following commands result in an `AttributeError: module 'reagent.gym.tests.test_gym' has no attribute 'run_test’` because the module `test_gym` does not exist.

```
export CONFIG=reagent/gym/tests/configs/cartpole/discrete_dqn_cartpole_online.yaml
./reagent/workflow/cli.py run reagent.gym.tests.test_gym.run_test $CONFIG
```

See full stacktrace [here](https://gist.github.com/avilay/ed728178aa47d3f9576c8fe08d0a2973).

Even when I try to run one of the existing modules like `run_test_online_episode` I get a `KeyError: 'state_features'...float_features=batch[InputColumn.STATE_FEATURES]`

Here is the full command:

```
./reagent/workflow/cli.py run reagent.gym.tests.test_gym.run_test_online_episode $CONFIG
```

See full stacktrace [here](https://gist.github.com/avilay/0c0ff1ddb045fe0e12d364dbdd3b2c3c)

On further trying the batch RL example the first command running the `offline_gym` module works fine. However, the second command running the `timeline_operator` errors out with `java.lang.StringIndexOutOfBoundsException: begin 0, end 3, length 2`. Here are the full commands that I ran:

```
export CONFIG=reagent/workflow/sample_configs/discrete_dqn_cartpole_offline.yaml
./reagent/workflow/cli.py run reagent.workflow.gym_batch_rl.offline_gym $CONFIG
./reagent/workflow/cli.py run reagent.workflow.gym_batch_rl.timeline_operator $CONFIG
```

See full stacktrace [here](https://gist.github.com/avilay/bd793bc75c970b1f572fccce3c330da8)

Here are my environment details:

* Hardware: Apple M1
* OS: Big Sur 11.2
* Anaconda Python 3.7
* JRE Details

* openjdk 16 2021-03-16
* OpenJDK Runtime Environment Zulu16.28+11-CA (build 16+36)
* OpenJDK 64-Bit Server VM Zulu16.28+11-CA (build 16+36, mixed mode)
* ReAgent master branch cloned on 4/23.
* I had to install a later version of OpenAI gym (0.18.0) because of compatibility issues with M1.