ACU agent: set_shutter task, to open/close shutter

[mhasself]

Description

For LAT, adds a task to open/close the shutter. Also reads out shutter state vars and saves them in the usual places.

Requires soaculib 0+untagged.187.g3de6ea0 (merged yesterday).

How Has This Been Tested?

Developed on ACU simulator, with datasets set up to match snapshots from LAT ACU.

Also tested on LAT, controlling the real shutter. Compatible with latest ocs-web shutter control widget.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[BrianJKoopman]

Looks good to me, just a couple of small questions/comments.

[mhasself]

Thanks -- added a warning and fixed the docstring.

[BrianJKoopman]

Thanks for the updates, looks good.