the idea behind ftp_nb_get is for it to be followed by multiple calls
to ftp_nb_continue in order to download a file piece-by-piece.
As such, it's unwise to close the stream used to write the downloaded
data to when the file hasn't been completely downloaded within the first
call to ftp_nb_get.
This regression was added in a93a462dce
and this patch restores the behavior that was seen pre-patch.
While running these on HHVM I've run into a lot of parallelism issues.
I'm backporting all the fixes I had to do in
https://github.com/facebook/hiphop-php/blob/master/hphp/tools/import_zend_test.py#L650
to php core.
Most of these changes were just filenames that were shared between
tests, but I did more surgery on the fixed ports. I can apreciate port
31337 as much as the next nerd, but random ports are better for tests.
