Don't error if multiple UDP row inputs match, unless their output differ

[udif]

This fixes #926 . It takes into account the 'keep previous state' output value when comparing UDP table rows. Also includes a new unit test.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.01%. Comparing base (9e15d4e) to head (1bd9f11).

Additional details and impacted files

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