graph.keys.wasted is not actually the value of wasted keys #98

From what I understand, the difference between num_cached_keys and num_cached_scripts does not equal the amount of wasted keys.
OPcache Keys are all the relative and absolute paths leading to a script.
So there are naturally more Keys than there are Scripts, the difference here however is not the amount of wasted keys.

https://image.slidesharecdn.com/yoopeecacheopcacheinternals-140222091502-phpapp02/95/yoopee-cache-op-cache-internals-45-638.jpg?cb=1445541473
https://www.slideshare.net/jpauli/yoopee-cache-op-cache-internals