Reasons:
- `test-async-wrap-getasyncid` binds a handle, so move to
sequential because port cannot be already in use.
- `test-dgram-implicit-bind-failure` requires a hardcoded
port number to properly send socket packet.
- `test-http-agent-uninitialized-with-handle` requires a
hardcoded port number to properly send http request.
- `test-http-agent-uninitialized` requires a hardcoded port
number to properly send http request.
- `test-net-localport` requires a hardcoded port number
for assertions.
In addition this replaces two common.PORTs with a dynamic port.
PR-URL: https://github.com/nodejs/node/pull/15151
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
