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 754b7d0d7706c4d04012a7626b7c3a7ac0aefe4d.
Merge pull request #88 from jpkrohling/master

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