Revert eventlet from 0.31.0 back to 0.30.2 due to incompatible with gunicorn 19.9.0 (#2782)
Revert eventlet from 0.31.0 back to 0.30.2 due to incompatible with gunicorn 19.9.0 (#2782)


cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue,cloudera/hue