Update placement of stack-action from 'options' to 'cli'

[PhillypHenning]

Small update to stack-action, removed from options and put into cli ....

Closes bitovi/bitops#227
Closes #18

[arm4b]

It will also need a README update

https://github.com/bitops-plugins/terraform#cli-and-options-configuration-of-terraform-bitopsschemayaml

and bitops.sh docs

Otherwise, the change makes sense. Looks like Cloudformation is defining it in the CLI too as @LeoDiazL mentioned.

[arm4b]

@PhillypHenning Once merged, will it be a breaking change for the users?
To keep in mind for the migration instructions.

[PhillypHenning]

Yes... it will have impact if people are using that configuration value, however, we need to standardize its placement across the plugins.

So; The sooner the better for the change.

The doc is being updated in tandem, but this isn't something I was actively working on, just noting.

[arm4b]

The PR looks good, we'll also need an official documentation update in the bitops.sh.
So ideally, if we could merge those changes in one go.

[PhillypHenning]

BitOps core doc updated bitovi/bitops#363