Handle EAI_AGAIN and retry

[elsbrock]

We use this tool in our CI pipeline. Thanks for maintaining!

We noticed the following error occuring frequently when our infrastructure is under load:

Waiting for myhost:30017..........................
   Unknown error occurred waiting for myhost:30017: Error: getaddrinfo EAI_AGAIN myhost

It would be great if npx could handle EAI_AGAIN and retry.

[dwmkerr]

@elsbrock I'm doing some cleanup and saw this issue hadn't been responded to, is there any chance if you are still having issues you can run with debugging enabled, so I can see exactly where the error occurs and put the appropriate retry logic in? To run with debug info just use:

DEBUG=wait-port wait-for myhost:30017

If I can see where to stitch the handler I'll add a flag to allow for retry if DNS fails.

Note to self/contributors; if the error occurs where I think it occurs, we just need another block like this:

https://github.com/dwmkerr/wait-port/blob/main/lib/wait-port.js#L104

The existing waitForDns flag is probably OK to overload here, but might be worth considering a new flag