net: do not prefer IPv4 addresses during resolution.

Currently, the address resolution family defaults to IPv4. This commit removes that preference, and instead attempts to resolve to a family suitable for the host.

@tjfontaine is this along the lines of what you wanted? This is my first time venturing into the core C++ layer, so forgive me if it's way off.

Closes #7637
Place the function declaration on the same line:
```
assert.throws(function() {
```