Revert "Split security.php for different env."

This reverts commit 0a2a0242be76bf40c65333ad1120a4a1a27ee8b9.
Revert "Point oauth2 debug endpoint for prod and dev to live version."

This reverts commit 04d7c3b7713da9d12d07a3e552edb02fda4f6a64.