- hpux returns EADDRINUSE when listening on UDP sockets, so
we need to check for that
- also need to ensure that subsidiary named processes are shut
down in the runtime system test
Conflicts:
bin/tests/system/conf.sh.in
lib/dns/win32/libdns.def.in
lib/isc/win32/file.c
The merge also needed to update files in legacy and tcp system tests
(newly introduced in master after branch was created) to introduce use
of lockfile.