Running hound on Infra

Run livegrep in infra: https://review.openstack.org/#/c/96877/ https://review.openstack.org/#/c/129726/ (actually Monty had suggested to me to run Hound instead, as it is able to update the index for the git repos which livegrep doesnt': https://github.com/etsy/hound) but either way a grep service (yah - hound is like a 5 minute task - would be a great first task for someone) setting up hound is a 5 minute task, writing the parser to parse the yaml files so it knows which repos to index might take longer than 5 minutes