discovery: handle deletion of 'wireproto' module
Mercurial commit b4d85bc122bd. deleted the wireproto module and its
contents are now in various other modules, so we can not even do
unchecked imports of it now.
# setup config and various utility to test new heads checks on push.$TESTDIR/testlib/common.shcat>>$HGRCPATH<<EOF[ui]# simpler log outputlogtemplate ="{node|short} ({phase}): {desc}\n"[phases]# non publishing serverpublish=False[extensions]# we need to strip some changeset for some test casesstrip=evolve=EOFsetuprepos(){echocreatingbasicserverandclientrepohginitservercdservermkcommitroothgphase--public.mkcommitA0cd..hgcloneserverclient}