test: introduce test/common/internet.addresses

This commit introduces test/common/internet.address, which
includes a set of addresses for doing internet tests.
These addresses can be overriden using NODE_TEST_* environment
variables.

PR-URL: https://github.com/nodejs/node/pull/16390


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Refael Ackermann <refack@gmail.com>
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>