Rework AJXP_Logger to expose all log levels
Currently errors are logged at INFO level

Signed-off-by: Etienne CHAMPETIER <etienne.champetier@fiducial.net>
Rework auth.ldap logging

Signed-off-by: Etienne CHAMPETIER <etienne.champetier@fiducial.net>
Replace all 'AJXP_Logger::logAction("error"' with 'AJXP_Logger::error('

Signed-off-by: Etienne CHAMPETIER <etienne.champetier@fiducial.net>