Marking vtnerd 2nd month 2020 q4 completed

Late updating this. Completed stuff related to attack, another optimization to p2p output, and changed expect<T> to boost::system::error_code. The last took longer to "tweak" than it should've due to subtle performance differences, but it helps with error reporting from HTTP->wallet which is used by the DANE/TLSA code for the wallet (which is still sitting in my private repo waiting for feedback on other PRs before submitting).