add unique names for celery workers
Revert "add unique names for celery workers"

This reverts commit 23dc37eb1af5ac4d2e4be4e1fae99f7394a58c9b.
add unique names for celery workers
Merge pull request #171 from caktus/celery-worker-names

add unique names for celery workers
escape % signs in worker names to make supervisor happy