runtests: prefer IPv4 to IPv6
To make IPv6 work, there are multiple areas that need to fix. Before they
all get fixed, use IPv4 by default.
This should fix tests caused on IPv6 systems.
# See http://EditorConfig.org for the specification
root = true
[*.py]
indent_size = 4
indent_style = space
trim_trailing_whitespace = true
[*.{c,h}]
indent_size = 8
indent_style = tab
trim_trailing_whitespace = true