hg: code-tools/trees: Make trees work with hg 4.6

[erik.joelsson at oracle.com]

Changeset: 592eba45b774
Author:    erikj
Date:      2018-07-11 09:31 -0700
URL:       http://hg.openjdk.java.net/code-tools/trees/rev/592eba45b774

Make trees work with hg 4.6

! tests/verlist.py
! trees.py