Syncing should revert a block when loading from network failed

[shuse2]

Expected behavior

Syncing should revert the block when it fails to load blocks from the network, but not when it fails to process.

https://github.com/LiskHQ/lisk-sdk/blob/v1.6.0/framework/src/modules/chain/submodules/blocks/process.js#L254-L343

Actual behavior

Behavior is opposite. It reverts a block when it fails to process, but it does not revert on the network load fails.

Steps to reproduce

Build a blockchain in a network, and connect to another network with the same dataset.

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

2.2-