ApsPssShutter and/or ShutterBase could support kwargs to define open_value and close_value

[prjemian]

Note that the ApsPssShutter support uses a fixed value of 1 when writing to then open:

apstools/apstools/devices/shutters.py

Line 451 in 11a9707

self.open_signal.put(1)

and close PV:

apstools/apstools/devices/shutters.py

Line 464 in 11a9707

self.close_signal.put(1)

The base class supports custom values for self.open_value and self.close_value:

apstools/apstools/devices/shutters.py

Lines 87 to 88 in 11a9707

	open_value = 1 # value of "open"
	close_value = 0 # value of "close"

The base class constructor does not provide kwargs to set these. Might be a good addition, otherwise need to set shutter.close_value=1 once the shutter object is created.

Originally posted by @prjemian in #1036 (comment)

[prjemian]

Since the open() and close() methods perform both set and reset, need to add open_reset_value and close_reset_value to replace fully these assumptions of 0 and 1:

apstools/apstools/devices/shutters.py

Lines 458 to 459 in 11a9707

	if self.open_signal.get() == 1:
	self.open_signal.put(0)

apstools/apstools/devices/shutters.py

Lines 471 to 472 in 11a9707

	if self.close_signal.get() == 1:
	self.close_signal.put(0)