Cleaned up dummies and updated default configs

* Removed useless hook stubs (full impl. later)
* Updated default config. for VOMS authN strategy
* Updated default config. for production ENV
Updated X.509-based authN plugins

* Tighter VOMS matching
* Added VO mapping for VOMS
* Added access policy for VOMS (whitelist/blacklist)
* Small update in pure X.509, checking verification status