Update response filter of get_node_info

[lzpap]

Description of change

coordinatorAddress in response of get_node_info is returned as an Address object instead of plain text.

Type of change

Choose a type of change, and delete any options that are not relevant.

• Enhancement (a non-breaking change which adds functionality)

How the change has been tested

Test case modified and passes.

Change checklist

• My code follows the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (docs/ directory and/or docstrings in source code)
• New and existing unit tests pass locally with my changes