Revert "Add a rule to allow redis from the jumpbox"

This reverts commit c10462641a8dac4a95d38b26526131167d3fea9c.

Turns out I was trying to start the api on jumpbox instead of
monitoring. Although in my defence there was an error message saying
"sensu-api dead but pidfile remaining"...
Merge pull request #502 from alphagov/revert-redis-ufw-rule

Revert "Add a rule to allow redis from the jumpbox"