Test import nodefs promises

[iambumblehead]

re #281

[iambumblehead]

I don't fully understand the probalm and solution. Things could be studied more but I would rather move on as all tests are passing.

Here is generally what I think I know. This line in the load hook stripped the entire query string from the url returned by the load hook

url = url.replace(esmkgdefsAndAfterRe, '')
/* ... */
return nextLoad(url, context)

Both load and resolve hooks return module url values. The load hook url is not always required, but the resolve hook url is required. Usually, when a module loads another module, the parent module url comes from a pior resolve hook call, but in our case here, the url came from the load hook and adding the import tree id onto the load url resolved the issue. The resolve hook is then called with that url and continues mocking that import tree.

[iambumblehead]

maybe it has been little bit too long of a wait waiting for review... merging this