More realtime output now available when using playbooks

I’ve made all the output about commands in playbooks use callbacks, so if you are attacking 500 hosts in a batch of 10, you’ll get output
as every single command happens (in real time), rather than waiting for all of them to complete, or even the whole batch of 10.

I have not yet done this for /usr/bin/ansible just yet… so it still waits until the end. This can change soon.

–Michael