Change log level to clean up allennlp command.

[schmmd]

This removes much of the noise from the allennlp command.

2018-11-01 15:48:30,734 - INFO - allennlp.common.registrable - instantiating registered subclass relu of <class 'allennlp.nn.activations.Activation'>
2018-11-01 15:48:30,735 - INFO - allennlp.common.registrable - instantiating registered subclass relu of <class 'allennlp.nn.activations.Activation'>
2018-11-01 15:48:30,736 - INFO - allennlp.common.registrable - instantiating registered subclass relu of <class 'allennlp.nn.activations.Activation'>
2018-11-01 15:48:30,736 - INFO - allennlp.common.registrable - instantiating registered subclass relu of <class 'allennlp.nn.activations.Activation'>
usage: allennlp

Run AllenNLP

optional arguments:
  -h, --help    show this help message and exit
  --version     show program's version number and exit

Commands:
  
    configure   Generate configuration stubs.
    train       Train a model
    evaluate    Evaluate the specified model + dataset
    predict     Use a trained model to make predictions.
    make-vocab  Create a vocabulary
    elmo        Use a trained model to make predictions.
    fine-tune   Continue training a model on a new dataset
    dry-run     Create a vocabulary, compute dataset statistics and other
                training utilities.
    test-install
                Run the unit tests.
    find-lr     Train a model
[INFO/MainProcess] process shutting down