Depends on D19341. Ref T12414. Ref T13120.

• Fix a bug where default-valued properties didn't get rendered in grey as they're supposed to (as a hint that the value isn't customized).
• When resetting a builtin property won't do anything, visually disable the button as a hint.
• Allow Services to specify properties on their Bindings.
• Specify that repository bindings have a "protocol" property, so it becomes an explicit thing in the UI. Previously, you had to read the documentation to figure this out.
• When editing bindings, use the EditField and its configuration if possible. This turns the "Protocol" property into a dropdown in the UI where you select between "http", "https" and "ssh".
• Give the "protocol" binding a smart default based on the port number of the corresponding interface.

• Viewed properties on Services, Devices and Bindings.
• Saw them render sensibly, and grey out + grey button when a builtin value has a default setting.
• Saw "Protocol" appear as a default property on repository cluster bindings and get a smart value.
• Edited "protocol", got a nice dropdown.