Merge pull request #854 from jikuja/fixes_for_v1.4.4

Fixes for v1.4.4
CHANGED: minor logging change

 * Downgrade java environment variable logging to logDebug() and
   print note that those variables will be ignored
 * Added one more env variable
ADDED: more debug messages into authlib

 * Log reason for AuthenticationUnavailableException if authlib
   has given cause for Exception