Correct Decrementing/Incrementing in forest-cli sync wait

[jdjaustin]

Issue summary

Currently, it appears that forest-cli sync wait displays an absolute epoch in the Todo: field (beginning with the target epoch) and decrements the epoch until reaching the current snapshot epoch, whereas Lotus displays a differential count of validations remaining. Forest should also display the differential count and possibly add amount of messages validated and/or validations per second (see Lotus screenshot). Lotus also appears to be incrementing the Current Epoch: field.

Other information and links

Forest screenshot:

Lotus screenshot:

[lemmih]

Working on this is a bit difficult without calibnet. It is possible to test with mainnet, though. Perhaps on a droplet.