Martin Berg db56748d88 Add attribute to show who last un/set alarm (SPC) (#9906)
* Add attribute to show who last un/set alarm.

This allows showing the name of the SPC user who last
issued an arm/disarm command and also allows for
automations to depend on this value.

* Optimize

* Update spc.py

* Update spc.py

* fix

* Fix test.

* Fix for removed is_state_attr.
2017-11-11 12:36:03 -08:00
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