validator vote distance query

[maciejkocylapc]

What's this PR do?

• DESCRIBE THE PURPOSE OF THE PR HERE

How should this be manually tested?

• List the testing steps here

What are the relevant tickets?

• URL to the PivotalTracker ticket

Task completed checklist:

• [] Is there appropriate test coverage?
• [] Did I take into consideration possible security vulnerabilities?
• [] Are the controllers secure?
• [] Was every important matter documented?

Things to watch out for

• [N] Does this PR have any migrations?
• [N] Does this PR add new dependencies?