Allow venv to not exist in start-service.sh tmpl
Only enable cloudera repo for zookeeper if package isn't available
Add retries to downloads
Add jnewbrough key
Add chef-handler cookbook with gelf handler
nimbus_context_agent cookbook fixes

Fix a typo, and sed chef output to remove control characters

per OOIION-605
Check for "None" passed as ddns hostname
Add carlosr key
Add mauricem key
Add edwardh key
Merge branch 'master' of github.com:ooici/dt-data into ape_agent