Moved set_is_ready with deprecation warning to HardwareObject.

[marcus-oscarsson]

The Device object defines three methods in addition to those defined on HardwareObject.

• is_ready - Also defined on HardwareObject
• set_is_ready - Only defined on Device
• userName - Previously refactored to name() (there are no reference to userName() in the code base)

Some objects that inherited Device where using the method called set_is_ready taking a boolean with the "ready state". set_is_ready was moved to HardwareObject, with a deprecation warning. The logic of set_is_ready was translated to internally work with the states defined in HardwareObjectState (still taking a boolean argument)
The semantics of is_ready and set_is_ready should thus be compatible with that originally defined on Device.

I will leave it up to each site to replace set_is_ready with the corresponding call to self.update_state(HardwareObjectState.READY) and then depending on the situation self.update_state(HardwareObjectState.BUSY|OFF). The set_is_ready method defined on HardwareObject uses HardwareObjectState.OFF.

Closes #1372