Clean up imports and remove misleading debug message from the VirJDBC module
VirAttributeMapper should interrupt the login process on JSON parse error
Db pooling fixes round 1 (#3)

The connection is represented by the class itself and we definitely need
the connection here so the lazy connection and validation is unnecessary.

Fail early, fail often. F*CK THE SYSTEM.
Merge pull request #6 from vbalazs/balo/bug_3_db_pool_fix

Db pooling fixes