runtests: check ports on IPv6 address
Previously, checkportisavailable only checks ports on the IPv4 address. This
patch makes it check IPv6 as well. It'll be useful if "localhost" does not
have an IPv4 address, or its IPv4 address does not exist somehow.
#require test-repo
$ . "$TESTDIR/helpers-testrepo.sh"
$ cd "$TESTDIR"/..
New errors are not allowed. Warnings are strongly discouraged.
$ hg files "set:(**.py or **.txt) - tests/**" | sed 's|\\|/|g' |
> python contrib/check-config.py