Cease use of fireball mode.

Fireball mode starts an ephemeral damon on the ansible nodes
to avoid initiating multiple ssh connections.

Fireball can't work when non-addressible nodes are accessed via
an ssh ProxyCommand, and the performance benefit it provides is
minimal, so I have removed it.
Merge pull request #2 from blueboxgroup/no-fireball

Cease use of fireball mode.