Spawned from Conversation with Michael on 
Twitter https://twitter.com/esacteksab/status/514558427217936384

Uncommenting host_key_checking = False, a playbook runs in 35s
Commenting host_key_checking = False, the playbook runs in 9m25s

But with it uncommented, ~10% of the servers return: "SSH Error: data could 
not be sent to the remote host. Make sure this host can be reached over 
ssh" 

With it commented, no failures, I'm able to communicate with all servers. 

This is a topic for to troubleshoot further, because Twitter and 140 chars 
isn't all that great. 

Ansible is 1.7.1 on Ubuntu 14.04
Servers are a combination of Ubuntu 12.04 and 14.04

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