Factor out getId() from Misbehaving(..) calls

Summary: Factor out repeated getId() calls from Misbehaving(..) lines.

Test Plan: make check

Reviewers: kyuupichan, freetrader, sickpig, deadalnix, #bitcoin_abc

Reviewed By: deadalnix, #bitcoin_abc

Subscribers: CCulianu

Differential Revision: https://reviews.bitcoinabc.org/D384