Complete states

[rominf]

It would be nice to complete state names and arguments.

I propose to add variable:

set salt_minion=localhost

And then gather completions with:

salt $salt_minion sys.state_argspec

[basepi]

The problem is that rarely is the local minion actually called "localhost". We may have to force the user to set the local minion's ID as part of turning this feature on. (It should be off by default, for sure)

[rominf]

@basepi
OK, I wasn't to precise with my proposal. The idea was actually to let user choose minion ID.

Actually, I think it's even better to allow user to give full string to allow salt-call too:

set salt_states_completion_string="salt-call --local sys.states_argspec"