Rework AJXP_Logger
- expose all log levels
- accept a variable number of argument

Signed-off-by: Etienne CHAMPETIER <etienne.champetier@fiducial.net>
Add logging functions to AJXP_Plugin class / put plugin id as log prefix

Signed-off-by: Etienne CHAMPETIER <etienne.champetier@fiducial.net>
Rework auth.ldap logging (use new functions)

Signed-off-by: Etienne CHAMPETIER <etienne.champetier@fiducial.net>
Replace AJXP_Logger::debug call with $this->logDebug in plugins

Signed-off-by: Etienne CHAMPETIER <etienne.champetier@fiducial.net>
Replace AJXP_Logger::logAction call with $this->logInfo in plugins

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