3 more passing tests for vfsstream.

Summary: Thanks to #4031. There are 3 more passing tests for vfsstream framework.
Closes https://github.com/facebook/hhvm/pull/4088

Reviewed By: @ptarjan

Differential Revision: D1646051

Signature: t1:1646051:1414571341:cc512824e49a1e67f523c0fd3cee5ef3e651db04
Fix for wrong PATH_INFO and PATH_TRANSLATED (maybe)

Summary: This might be a fix for #4048. If I didn't miss anything, the fastcgi variable PATH_INFO was not even read before.

This works for my setup (nginx + standard hhvm.conf) but I am not sure if just using the variables fastcgi provides is always the right way.

Any feedback is appreciated.
Closes https://github.com/facebook/hhvm/pull/4059

Reviewed By: @ptarjan

Differential Revision: D1639777

Signature: t1:1639777:1414573031:bd8749a1f88ad62870c3cdcedbb5deaad66507d3