[BUG] This fix allows the upload of same filenames in input type file

[codisart]

For example, Safari on IOS gives the name image.jpg for pictures from the gallery
In the present situation, the first files would be overriden by the last file with the same name.
And the getValue of these inputs will return the same fileName with no really mean to identify it.
With the use of the unique name from PHP $_FILES in the name column of the $_files array of the Http adapter, the files will be unique and easily identifiable.

I have adjusted the unit test for the File/Transfer/Adapter/HttpTest::testMultiFiles() method and added one for a same name case.

First, the $_FILES is mocked with the implication that the "name" value can be a path with more than one directory. Shouldn't it be only a filename like picture.jpg, document.docx or script.php ?

Secondly, the "tmp_name" value doesn't seem to be mocked properly, or the format %TMP_DIRECTORY%/php123456 can be overriden ?

Codisart

[wolxXx]

sadly, this breakes the possibility to save the original file name.
in my case, a single file is uploaded with the example name "foobar.jpg" and will be renamed to "[php_3532 as php tmp file name]_foobar.jpg"... so now i must parse the tmp file out of the new file name..
that's weird..
it would be nice if the rename in https://github.com/zendframework/zend-file/blob/master/src/Transfer/Adapter/Http.php#L454 would be optionally.