Ticket1405 iris cryo valve

[AdrianPotter]

Description of work

Add the OPI for the Iris cryo valve IOC

To test

Ticket #1405

Acceptance criteria

The OPI for the Iris Cryo Valve IOC is available as expected and provides the usability expected for the device.

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Code Review

• Is the code of an acceptable quality?
• Does the code conform to the coding standards? Is it well structured with small focussed classes/methods/functions?
• Are there unit tests in place? Are the unit tests small and test the a class in isolation?
• Are there system tests in place? Do they test a minimal set of functionality and leave the gui as close as possible to its original state?
• Have the changes been documented in the release notes. If so, do they describe the changes appropriately?

Functional Tests

• Do changes function as described? Add comments below that describe the tests performed.
• How do the changes handle unexpected situations, e.g. bad input?
• Has developer documentation been updated if required?