Add feature to disconnect peers as part of shuffling algorithm

[shuse2]

Description

In lisk-p2p phase2 from LIP0004, we are going to implement peer shuffling on outgoing connections.

Over the course of 30 blocks (approximately 5 minutes), one outgoing connection is chosen uniformly at random and terminated at a random time during the interval of 30 blocks.

We need to consider fixed and black peers list here to make sure we don't connect with blacklist peer and we don't drop connection with fixedlist peer.

[jondubois]

Based on a few discussions with @diego-G, it was decided to separate peer management into three concerns:

• Populating the connected peer list up to a desired size.
• Removing (and disconnecting) peers from the connected peer list (e.g. can be caused by banning, shuffling or failed internet connection).
• Preventing invalid peers from connecting.

This issue should implement the 'removing' part of the shuffling. The populating algorithm will automatically replenish the list with a different peer from the network (just like it already does if an existing peer drops/loses their connection).