Calculate consensus only from outbound connected peers - Closes #3969

[diego-G]

How to manually test it?

npx mocha --opts test/mocha/mocha.opts test/mocha/unit/modules/chain/peers.js
npx mocha --opts test/mocha/mocha.opts test/mocha/unit/modules/http_api/controllers/node.js
npx mocha --opts test/mocha/mocha.opts test/mocha/unit/modules/network/lookup_peers_ips.js 

Review checklist

• The PR resolves Avoid low broadhash consensus attacks in partial mesh network #3969
• All new code is covered with unit tests
• Relevant integration / functional tests are added
• Commit messages follow the commit guidelines
• Documentation has been added/updated

[mitsuaki-u]

LGTM one comment to modify getUniqueConnectedPeers

[ishantiw]

looks good, just a couple of comments about whether we need to add an action to expose outbound list at the moment and about outbound peers test in peer_pool