Revert "Ability to specify several URLs corresponding to individual producer nodes when specifying a consumer so that users' requests can be spread across a pool of available producer nodes"

This reverts commit f830f9a7ad7ec59960c97ef446006c21e3178926.
Merge pull request #87 from jpkrohling/2.0.x

Revert "Ability to specify several URLs corresponding to individual prod...