Task https://issues.infn.it/jira/browse/STOR-426 done
Merge branch 'feature/STOR-426' into pref
Merge branch 'develop' into pref
WIP: http client sane initialization.
Some changes to make the service faster

- Use VOMS caching validator
- Place security context in session
- Single HTTP client shared among several client threads
- Force the use of canl non-lazy validators
WIP: consistent exception handling

- StorageAreaManager uses common HTTP client
Updated http call to storage-area-list configuration version 1.2
Updated authorization alghorithm for both webdav and filetransfer
services
abort requests doesn't affect the returned error
Fixed HttpClient creation
Forcing to anonymous removed
Fixed the storage area permissions evaluation algorithm of root page
requests
Useless code removed
Authorization refactored
Fixed returned error codes
Little adjustments
Other adjustments
Cosmetic fixes
Merge pull request #7 from italiangrid/fix/STOR-465

Fix/stor 465
Remove authz call enable flag from configuration.