Renamed Zend Optimizer+ into Zend OPcache

Add oom, wasted, hash and manual restart counters to help identify potential configuration problems

Merge Zend Optimizer+

git-subtree-dir: ext/opcache
git-subtree-mainline: b1dbfb73571b051fef055dc371e05163cf73eb8b
git-subtree-split: 8d35170c5fe9b9c0c864b7a6c4dc6b0149809569