fix many parallel test issues

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.