instance-state and state in status

[Kapil Thangavelu]

Excerpts from Gustavo Niemeyer's message of 2012-03-07 13:42:26 -0500:
> > I'd support a change to 'agent-state' or 'machine-agent'. Those make it
> > quite obvious what is being reported.
> 
> +1 on agent-state. Better counterpart for instance-state than my suggestion.
> 
> > It needs to be done before Ubuntu 12.04 though, otherwise this becomes
> > an incompatible change for anybody who has integrated with juju and
> > expects it to be called 'state'.
> 
> Sounds good for me. Kapil?

Sounds good, per our discussion on irc, agent-state will also be used for the 
unit's 'state' key in status as well.

cheers,

Kapil