Discovery is too reliant on seed peers

[jondubois]

Expected behavior

The discovery should start with the seed peers but when the interval executes again, it should use some of the newly discovered peers as the new seeds.

Actual behavior

There is a bug in the current discovery algorithm which means that our node always go back to the seed peers for discovery.

Steps to reproduce

Check the code.

Which version(s) does this affect? (Environment, OS, etc...)

0.1.0-alpha.9

[ishantiw]

@jondubois I think we need to use triedPeers and newPeers or just triedPeers when we start discovering in intervals, seems like we are just passing seed peers again and again, every time we do discovery,
https://github.com/LiskHQ/lisk-sdk/blob/development/elements/lisk-p2p/src/p2p.ts#L562