New logging function for LDM

Hello,

As I was cleaning up much of the new LDM code, I noticed we actually log
a lot of information but had only two categories, info and error.

In order to improve the situation, I removed the two old functions
(loginfo and logerr) and replaced them by a single "log_entry" function.

This function works as follow:
log_entry("component",<level>,"message");

Where "component" can be something like "ldm", "ssh", "rdesktop", ...
"level" is one of the following SYSLOG log levels:

LOG_EMERG   = 0     => unused
LOG_ALERT   = 1     => unused
LOG_CRIT    = 2     => die()
LOG_ERR     = 3     => Errors
LOG_WARNING = 4     => Warnings
LOG_NOTICE  = 5     => Notices
LOG_INFO    = 6     => Information
LOG_DEBUG   = 7     => Debug information

Current code uses the numeric value instead of the constant in most
calls.

"message" is the text you want to see added to the log, it can be
formated.

I converted all the current code to use that function and started a
build in my PPA. I'll run that in production here and depending on the
usefulness of the output, I'll adapt the level for each log entry.

Next step will be to add another environment variable to set the log
level when want to see in syslog/logfile.
It'll probably be something like LDM_LOGLEVEL containing a numeric value
from 0 to 7.

-- 
Stéphane Graber
Ubuntu developer
http://www.ubuntu.com

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