Move ZenUtils.redis to ZenUtils.RedisUtils

ZenUtils/redis was hiding Python2.7/site-packages/redis when running commands from the ZenUtils directory (e.g. ZenUtils/zenpack.py)

Fixes https://jira.zenoss.com/browse/ZEN-15047

See also https://github.com/zenoss/ZenPacks.zenoss.EnterpriseCollector/pull/17